Nearly 26 million ballots have been requested or mailed to voters around the country, according to McDonald’s tally. That’s more than the approximately 25 million voters who cast a ballot early in the 2014 midterms, either by mail or in person. Millions more will vote in person when early voting locations open in their areas.

Already, more than 800,000 Florida residents have voted in competitive races for governor and a U.S. Senate seat. Nearly half a million Californians have cast their ballot. So have more than 200,000 people in Tennessee and Arizona. More than 100,000 ballots have been submitted in Illinois, Iowa, Michigan, Minnesota and Wisconsin.

McDonald estimated that midterm turnout could be as high as 50 percent of the voting-eligible population, a peak last reached in the 1966 midterm elections.