Why the 2026 Midterm Could Break a Rare Presidential Streak

U.S. CPI and the unemployment rate have both settled at 4.2% simultaneously, a numerical coincidence that Bank of America’s Michael Hartnett is treating as anything but accidental. In his latest research note, the strategist reads this convergence not as a headline curiosity but as a late-cycle warning sitting quietly underneath a market that has barely paused to notice.

Hartnett’s argument operates on two timescales at once. On the long scale: by Hartnett’s count, Trump’s second term is positioned to join a very short list, only the fourth presidential administration since 1873, to deliver positive stock market returns in each individual year of a full term. On the near-term scale: in his view, the midterm elections stand as the single event most capable of determining Wall Street’s direction in the second half of 2026. These two observations are not separate claims. They are connected: the midterm outcome is the event most likely to either extend or end the streak.

Here is the framework for evaluating Hartnett’s thesis on its own terms, separating the parts grounded in independently verifiable history from the parts that belong to his interpretive construction, and giving you a structured way to think about equity risk over the next six months without treating the outcome as predetermined.

What Hartnett is actually claiming, and what the historical record can verify

Hartnett’s headline claim is striking enough to warrant careful handling.

According to Bank of America’s Michael Hartnett, Trump’s second term is positioned to enter rare historical company, potentially becoming only the fourth presidential administration since 1873 to achieve gains in every single year across a full four-year term.

That statistic does not appear in standard public financial databases. It belongs to Hartnett’s proprietary presidential cycle framework, and it should be read accordingly. The question is whether the underlying logic holds even if the precise anchor date cannot be independently confirmed.

It does, at least directionally. The independently verifiable record tells a consistent story about the rarity of extended winning streaks:

• Independently verified: The S&P 500 has posted losing years in roughly one-quarter of all calendar years since 1926 (approximately 24 out of 89 between 1926 and 2014). Three consecutive years of double-digit gains have occurred only eight times in that same span. The long-term nominal annual return sits at approximately 10%; real returns at approximately 6-7%.
• Attributed to Hartnett’s framework: The specific “fourth administration since 1873” statistic, the anchor date of 1873 itself, and the framing of a four-year all-gain streak as a presidential-term phenomenon rather than a calendar-year pattern.
• Scenario-based extension: The claim that the streak could be broken by a specific midterm outcome, which rests on Hartnett’s conditional scenario analysis rather than a mechanical historical rule.

The distinction matters. A verified base rate tells you the odds. A proprietary framework tells you one strategist’s reading of those odds. 2023 and 2024 delivered confirmed strong returns for the S&P 500, with gains concentrated in large-cap growth and AI-related names, so the first two years of the streak stand on solid ground. Whether the framework built around them functions as a law or a lens determines how much conviction it should carry.

The presidential election cycle pattern the data does support

Strip away Hartnett’s proprietary framing and there is still a well-documented empirical pattern underneath it. The presidential election cycle, studied across academic and practitioner literature from 1926 onward, shows a consistent rhythm in equity returns depending on where a given year falls relative to a presidential term.

Year 2, the midterm year, has historically produced the weakest average returns of the four-year cycle. Year 3, the pre-election year, has historically produced the strongest. The 12 months following midterm elections have delivered above-average returns on average, regardless of which party wins, a pattern broadly attributed to the clearing of policy uncertainty that midterm campaigns generate.

The fact that Year 2 has historically been the weakest and that the post-midterm window has historically been the strongest is not a prediction for 2026. But it is the base rate context against which Hartnett’s “binary risk” framing becomes intelligible. When he calls the midterm the most consequential event for markets in the second half, he is not inventing a concern. He is placing it within a pattern that the data has supported across decades of election cycles.

The post-midterm return pattern has held across cycles marked by recessions, elevated inflation, and geopolitical shocks, with the driving mechanism being uncertainty resolution rather than any specific policy outcome; the clearing of election results has historically been sufficient to unlock sidelined capital regardless of which party emerges with control.

The 4.2%/4.2% convergence and what the macro literature actually says about it

In his research note, Bank of America’s Michael Hartnett drew attention to U.S. CPI and the unemployment rate both sitting at 4.2% simultaneously, describing this alignment as uncommon in the historical record and noting that similar readings have tended to appear in periods that gave way to Federal Reserve tightening cycles which markets subsequently judged harshly.

The framing is Hartnett’s. No standard macro framework treats exact numerical equality between the CPI rate and the unemployment rate as a formal policy threshold. The specific 4.2%/4.2% figure functions as a rhetorical anchor in his analysis rather than a recognised rule.

That said, the underlying concern it points toward is analytically sound. When inflation remains elevated and the labour market remains firm at the same time, the Federal Reserve’s room to stay patient narrows. The question becomes: allow inflation to run and risk de-anchoring expectations, or tighten into a still-strong labour market and risk a later, sharper slowdown. Historically, tightening cycles that begin late have often been associated with poor subsequent equity returns, particularly when valuations are already elevated.

Markets are now pricing a 65-70% rate hike probability by December 2026, a full reversal from the 50-75 basis points of cuts that were consensus just ten weeks earlier, with Goldman Sachs forecasting April core PCE at 3.8% year-over-year against the Fed’s own year-end projection of roughly 3.0%.

The established macro frameworks behind the concern

The three frameworks that actually formalise this tension are worth knowing, because they are the tools you can use to stress-test Hartnett’s signal yourself:

• Phillips curve: The observed inverse relationship between inflation and unemployment. When both readings are elevated simultaneously (as the 4.2%/4.2% convergence implies), the standard trade-off the Fed relies on to calibrate policy breaks down, complicating its decision-making.
• NAIRU (Non-Accelerating Inflation Rate of Unemployment): The estimated unemployment rate below which inflation tends to accelerate. If actual unemployment sits near or below NAIRU while inflation remains above target, the Fed faces pressure to tighten even if the economy appears healthy on the surface.
• Sahm Rule: A recession signal that triggers when the three-month moving average of the unemployment rate rises by 0.5 percentage points or more relative to its 12-month low. It uses changes in unemployment relative to its own recent trend, not CPI comparisons, making it structurally different from Hartnett’s convergence framing. The two should not be conflated.

The honest read of Hartnett’s indicator is this: he is using a numerical coincidence as a memorable anchor for a legitimate concern. When inflation and employment are both holding firm, the Fed’s decision space narrows, and markets historically have not handled that narrowing well. That is the takeaway, not the number itself.

How Hartnett frames the four conditions that kept the bears sidelined in H1 2026

Hartnett’s research note identifies four specific conditions whose absence kept bearish sentiment subdued through the first half of 2026. Framed as negatives that did not materialise, they collectively define the conditional structure of the current bull case:

1. No economic hard landing. The U.S. economy avoided a sharp contraction, meaning the recession risk that would have pulled equity valuations down aggressively did not arrive. This condition has already passed through its primary risk window.
2. No Federal Reserve rate hike. The Fed held its posture without moving to tighten further, preserving the rate environment that has supported equity multiples. This condition has passed through its H1 risk window, though it remains sensitive to the CPI-unemployment dynamic discussed above.
3. No reduction in AI capital expenditure. Spending on AI infrastructure, which has been the dominant structural support for large-cap growth and market leadership since 2023, continued at pace. Any deceleration here would remove the earnings growth narrative underpinning the market’s most concentrated gains.
4. No Democratic sweep in the midterms. The midterm election has not yet occurred, and this is the one condition that remains fully live as a risk variable heading into H2.

The framing matters. The bull case in 2026 has not been unconditional optimism. It has been a set of specific things that did not happen. Each of those conditions could still reverse, and each reversal carries different implications for the streak Hartnett has documented. Three of the four have already cleared their primary risk windows. The midterm election has not.

Why the midterm election is the variable that matters most for the streak

In his Bank of America research note, Hartnett identifies the midterm election as the event carrying the greatest binary weight for markets across the back half of 2026, framing it as the single outcome with the most direct bearing on whether the current conditions hold.

The characterisation is his, not a mechanical historical law, but the logic behind it is structurally coherent. The midterm is the one remaining event in 2026 with the scale to shift multiple conditions simultaneously. A change in Congressional control that alters the policy environment on taxation, spending, or regulation could rewrite the terms under which the current bull market has been sustained.

Hartnett’s scenario analysis, attributed to his framework, suggests that a Democratic sweep would represent the most direct threat to the four-year gain streak, because it would change the fiscal and regulatory backdrop that has supported equity valuations through the term. That is an interpretive political-risk extrapolation, not a historical rule, and it should be handled accordingly.

Two conditional paths emerge from this framing:

• Conditions hold: Congressional composition remains favourable to the current policy environment. The uncertainty-clearing effect documented across historical midterm cycles provides a tailwind. The streak extends into Year 3 of the term, consistent with the presidential cycle’s strongest historical return year.
• Conditions shift: A meaningful change in Congressional control introduces policy uncertainty on multiple fronts simultaneously. The structural supports, particularly the fiscal and regulatory assumptions embedded in current valuations, face re-pricing risk.

The post-midterm 12-month period has historically delivered above-average returns on average, regardless of which party wins. But that pattern reflects the clearing of uncertainty, not immunity from specific policy outcomes. If the outcome is sufficiently disruptive to the conditions Hartnett has identified, the structural tailwind could be overridden.

What this tells you is that the midterm is not binary because one outcome is definitively good and the other definitively bad. It is binary because it is the one event with the leverage to shift multiple variables at once: policy certainty, Fed posture expectations, and sector leadership.

Reading the Hartnett framework without over-indexing on it

Hartnett’s presidential cycle framework is useful in the way that any well-constructed analytical lens is useful: it organises your attention around specific variables rather than letting it scatter across noise. The parts grounded in verified base rates, Year 2 weakness, post-midterm return tendencies, the rarity of extended winning streaks, are independently documented. The parts that belong to his interpretive construction, the 1873 anchor, the 4.2%/4.2% signal, the streak framing itself, require Hartnett attribution and a lower confidence weighting.

Three variables warrant monitoring through H2 2026, each derived from the conditional structure Hartnett has mapped:

1. The midterm election outcome and its policy implications. This is the highest-leverage variable because it can shift multiple conditions simultaneously. Monitor not just the result but the specific policy signals that emerge from it.
2. Any Federal Reserve posture shift. If the CPI-unemployment dynamic tightens further, the Fed’s room to hold narrows. A move toward tightening when valuations are elevated historically has not been kind to equities.
3. Signs of AI capital expenditure deceleration. This is the structural support most sensitive to rate expectations. If AI spending slows, the earnings growth narrative behind the market’s most concentrated gains weakens, and the broad index loses its engine.

The Fed leadership transition adds a layer of hawkish uncertainty that runs parallel to the data-driven repricing: Kevin Warsh, sworn in as Chair on 22 May 2026, holds a structurally higher view of the neutral rate than his predecessor and has pledged to accelerate quantitative tightening, introducing an independent upward pressure on long-term yields that operates regardless of whether CPI and unemployment readings move in a more favourable direction.

The long-term S&P 500 return of approximately 10% nominal annually is the anchor against which any elevated risk assessment should be held. Historically, similar setups have often coincided with periods of above-average volatility. The conditional probability of a sharper drawdown rises if multiple conditions shift at once.

The reader who treats Hartnett’s streak claim as a law will be poorly positioned. The reader who treats it as a structured set of conditional risks, with specific variables to monitor, will be better positioned to respond rather than react.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. These statements are speculative and subject to change based on market developments and company performance.

What the streak record changes, and what it does not

The analytical tension at the centre of Hartnett’s framework is real: a historically rare multi-year gain streak, a macro backdrop with a genuine late-cycle signal, and a political event with the scale to shift multiple conditions simultaneously. None of these observations are trivial, and together they form a coherent risk map for the second half of 2026.

The value of Hartnett’s presidential cycle analysis is not the prediction it implies but the discipline it enforces. It forces you to name the specific conditions under which your thesis holds, and then to watch for the specific events that could change them. The midterm election is the event that will test the most of those conditions at once. Whether the streak extends or ends, the framework gives you a better question to ask than “will the market go up?”

Investors wanting to stress-test how direct government involvement reshapes individual equity valuations will find our deep-dive into political influence on stock prices examines documented cases including the U.S. government’s equity stake in Intel and the precedent it sets for interpreting sector-specific announcements through a political timing lens.