Progressive candidate Kentucky state Rep. Charles Booker has pulled ahead of Amy McGrath, a retired Marine lieutenant colonel, in his upset bid in Kentucky’s Democratic U.S. Senate primary, but most votes have yet to be counted.

The current tally includes only votes cast in person at the polls on Tuesday. Hundreds of thousands of mail-in ballots that will likely determine the outcome of the race have not yet been counted and will not be for days.

Booker leds with 44% of the votes (over 32,000 votes) with McGrath following behind with 40% (almost 30,000) at the time of reporting (9:45 am 6/26/2020).

Booker says he’s in a strong position to “bring this home” once all the votes are counted. McGrath’s campaign says it’s confident she’ll emerge as the nominee.

In a statement Thursday afternoon, Booker said, “We’re going to have to wait a few days for final results, but we are fired up by what we’re already seeing in the early returns.”

The Kentucky secretary of state said that 161,238 people voted in-person on Tuesday. By Tuesday morning, 530,196 of the 867,842 ballots sent out before the election had already been returned. Any mail-in ballot postmarked by Tuesday will be counted.

The winner faces an uphill battle against Republican Senate Majority Leader Mitch McConnell, who is seeking a seventh term.