Historical midterm election data stretching back a century suggests Republicans face headwinds in November's congressional elections, but the party's losses may be smaller than historical averages indicate, according to an analysis of congressional records from 1926 through 2022.
The study, conducted by J.T. Young and published by The Hill, found that the president's party has lost an average of 11.3 percent of its House seats and 6.7 percent of its Senate seats in midterm elections over that span. Applying those long-term averages to current conditions would result in Republicans losing approximately 25 House seats and four Senate seats.
However, Young noted significant variability within the century-long trend, with more recent midterms showing smaller average losses for the sitting president's party.
What the Left Is Saying
Progressive analysts argue that historical patterns may not fully account for current political conditions. The Democratic Congressional Campaign Committee has pointed to suburban voter trends and concerns about federal spending as potential areas of strength heading into November, according to statements from party officials.
Democratic strategists have emphasized that the party's 2024 presidential victory coalition, which included significant support from college-educated suburban voters and young people, could provide a foundation for gains in competitive House districts. The Democratic Senatorial Campaign Committee has identified several Republican-held seats in states like Georgia, New Hampshire and Michigan as potential pickup opportunities.
Some progressive commentators have argued that recent Supreme Court decisions on regulatory authority and ongoing legal challenges to the Trump administration's tariff policies could motivate Democratic base voters who sat out previous midterm elections. A memo from a major progressive advocacy group obtained by Politico noted that 'kitchen-table economics' remained the party's strongest messaging terrain heading into the fall.
What the Right Is Saying
Republican strategists point to several factors that could limit their losses compared to historical averages. The National Republican Congressional Committee has highlighted redistricting gains in states like South Carolina, Florida, Louisiana, Missouri, North Carolina, Ohio, Tennessee and Texas as potentially adding eight or more seats to the GOP column.
The analysis from Young noted that since 1986, the president's party has lost an average of just 9.2 percent of House seats during midterms, compared to 11.3 percent over the full century-long period. Based on those more recent trends, Republicans would lose approximately 20 House seats rather than 25.
Conservative commentators have emphasized that this represents Trump's second midterm year, a historical context where the president's party has sometimes performed better in House races while facing steeper Senate losses. The analysis showed that from 1986 to 2022, presidential parties lost only 5 percent of House seats during second midterms but shed 10.7 percent of Senate seats.
Senate Republican campaign officials have noted they are defending 22 of the 35 seats up this cycle, with Vice President JD Vance's tie-breaking vote ensuring GOP control regardless of whether Democrats flip three seats. The party has identified North Carolina, Maine and Texas as defensive priorities while arguing that Democratic-held seats in Ohio could be competitive.
What the Numbers Show
According to Young's calculations based on official House and Senate records from 1926 through 2022: The long-term average midterm loss for the president's party is 11.3 percent of House seats and 6.7 percent of Senate seats. Under that scenario, Republicans would lose roughly 25 House seats and four Senate seats.
The more recent historical period (1986-2022) shows smaller averages: 9.2 percent House seat loss and 5.8 percent Senate seat loss. That would translate to approximately 20 Republican House losses and three Senate losses, resulting in a 50-50 Senate split with Vance holding the tiebreaker.
Second midterms since 1986 show an even more favorable pattern for the president's party in House races: just 5 percent average losses. However, Senate losses averaged 10.7 percent during those elections. If that second-midterm pattern holds, Republicans would lose about 11 House seats but six Senate seats.
On redistricting: Democrats are projected to gain approximately six seats through new maps in California and Utah, while Republicans could add up to 16 seats from redrawn districts across eight states. The net effect of those redistricting changes could offset a significant portion of traditional midterm losses.
In the Senate specifically, Young noted that even if Democrats won every competitive race, a four-seat Republican loss would equal just 7.5 percent of the caucus — below the second-midterm average of 10.7 percent but slightly above the overall 1986-2022 midterm average of 5.8 percent.
The Bottom Line
Historical data provides Republicans with a plausible argument that their midterm losses will be smaller than what past presidential parties have experienced, particularly in the House where redistricting benefits could offset traditional swing-seat volatility.
The Senate presents a more complex picture. Republicans are defending significantly more seats this cycle, and second-midterm historical patterns suggest steeper Senate losses for the president's party — but raw numbers alone can mislead since only a handful of races are considered genuinely competitive on either side.
What remains uncertain is whether current political conditions — including unusual tariff policies, legal challenges to executive authority, and shifting suburban voter coalitions — represent an anomaly that historical patterns cannot predict or simply another data point within the existing range of midterm outcomes. Republicans appear positioned for losses but may avoid the sweeping wave elections that have periodically reshaped congressional majorities.
Voters in competitive districts will ultimately determine whether this November follows Reagan-Clinton's modest second-midterm pattern, George W. Bush-Obama's larger swings, or something outside historical precedent entirely.