People vote at outdoor booths during early voting for the mid-term elections in Pasadena, California on November 3, 2018.

Early voters are poised to make history.

With just one day to go until hundreds of politicians face off in the midterm elections, more than 35 million votes have already been cast in early voting nationwide.

That figure, found Monday by NBC News' Data Analytics Lab using voter file data from TargetSmart, easily eclipses the total in 2014, when fewer than 20 million early votes were counted on the day before the midterms.

"We're well beyond historic midterms now," said Bryon Allen, chief research officer at political consulting firm WPA Intelligence.

But despite recent surveys indicating that a surge of young voter participation will carry the day for Democrats, TargetSmart's data from states with early voting suggest that the tallies so far have been virtually split between the two major parties. As of Monday, 42 percent of early voters are Republicans, compared with 41 percent of Democrats and 17 percent with another party affiliation, NBC found.