US midterm elections traditionally combine lower turnout with a protest vote against the president’s party. While participation in recent presidential elections has risen to around 65% of citizens of voting age, turnout was only 46% in the midterms held four years ago. Registered voters tend to vote at high rates, but many eligible citizens are not registered, and independents—now representing 45% of registered voters—often abstain in congressional elections held between presidential contests.
This year, the key uncertainty is whether disappointed Republicans will also stay home. Democrats are unlikely to benefit from a mass switch of Republican voters, but abstention among Republican and MAGA supporters could help them in closely contested races. At the same time, discontented Democrats may reinforce the traditional midterm tendency to vote against the governing party.
The campaign issues described in the available analysis currently put Republicans at a disadvantage. Rising prices for fuel, food and other goods are being linked respectively to the War in Iran and import tariffs, while higher mortgage costs mean inflation is affecting both cars and housing. Opposition to the war is also growing, despite Donald Trump’s previous promises, alongside criticism of alleged corruption involving members of his family and associates. There is additional anger over the treatment of immigrants, although support for border control remains broadly intact.
Discontent on the right is not expected to produce substantial support for Democrats. Some MAGA activists have broken with Trump over the war in Iran, developed anti-Zionist positions or criticized the continued non-publication of all the Epstein papers. In the polarized political environment, however, this dissatisfaction is more likely to result in abstention than a transfer of votes to the Democratic Party.
The Democratic Socialists of America are presented as a smaller counterpoint on the left. The group has moved away from some previously controversial proposals and is focusing more on alleged moral and financial corruption among Republican candidates. Even so, the influence of both extremes is expected to remain limited because they support only about 5% of the candidates in each party.
To change the House majority, Democrats would need to retain all their current seats and win at least four of the 221 Republican-controlled or vacant seats. In the Senate, they would need to hold every seat they currently control and capture at least four of the 20 seats being contested that are currently held by Republicans. The analysis therefore describes the Democratic challenge as requiring gains in a small share of Republican-held House seats and a much larger proportion of Republican-held Senate seats at stake.
Polling adds another layer of uncertainty. Since the spread of mobile phones, surveys have obtained responses from only around 10% to 15% of people contacted. More than 1,000 polls have been published during the campaign, but together they have received responses from less than 1% of registered voters. The analysis argues that angry Democrats have been more willing to respond than disappointed Republicans, potentially causing Democratic support to be overstated.
In the past five elections, polls overestimated the Democratic vote by an average of 3% in House races and 6% in Senate contests. If current surveys were again overstating Democratic support by 3% in every state, Republicans could hold states such as Iowa, Kansas and Michigan, while Democrats might still win Senate races in traditionally Republican states including Alaska, Ohio and Texas. The final outcome therefore remains highly uncertain.
Sources: La Vanguardia.