As Americans head to the polls in the much-anticipated midterms, a record number of voters identifying as independent could prove decisive for control of the US Congress and state legislatures. Nearly half of US voters, as many as 117 million adults, now identify as politically independent, with the two major parties, Democrats and Republicans, actively seeking their support.

Despite this surge in independent identification, third-party and independent candidates continue to face significant hurdles in penetrating the deeply entrenched two-party system. For generations, the Democratic and Republican parties have overwhelmingly dominated American politics at all levels, from local state legislatures to the halls of Congress and the presidency.

Political scientist AJ Simmons notes that "for decades, candidates outside the Democratic and Republican parties have struggled to achieve [a high] level of support." However, he adds that "2026 is shaping up to be one of the strongest election cycles for independent candidates in recent memory." This sentiment is echoed by Rick Bennett, a former Republican Party chair in Maine, who is running for governor as an independent. He observes that the "whole [electoral] system is built to frustrate the independence of voters."

The implications of this independent voting bloc are significant. While the number of voters eschewing party labels is at an all-time high, the actual number of independent candidates winning federal or state seats remains remarkably low. This dynamic creates a crucial battleground for the major parties, who must appeal to these voters to secure victories.

Data from the Pew Research Center's annual National Public Opinion Reference Survey indicates that 44 percent of US adults identify as politically independent, compared to 29 percent identifying as Democrat and 28 percent as Republican. However, a crucial nuance exists: the vast majority of these self-described independents still lean towards one of the two major parties when casting their ballots.

"True" independents, those expressing absolutely no partisan leaning, constitute only about 7-10 percent of the total electorate. These voters are highly sought after by campaigns as they represent the core of the coveted swing vote in an increasingly polarized political landscape. Their persuadability makes them a key demographic for both Democrats and Republicans.

In the current 2026 midterm elections, preliminary data suggests that 52 percent of likely independent voters are expressing support for Democratic candidates, while 39 percent are leaning towards Republicans. This indicates that while independents may not elect many of their own, their collective choices can significantly alter the balance of power between the established parties.

This trend highlights the persistent challenge for independent movements and third parties in the United States. Factors such as ballot access laws, campaign finance regulations, and the ingrained habits of voters often favor the established duopoly, making it exceptionally difficult for alternative candidacies to gain traction and achieve electoral success, even with a growing pool of disaffected voters.