It's official: Mississippi a runoff
© Getty, courtesy of Chris McDaniel

Mississippi's GOP nominee for the Senate will be decided in a June 24 runoff between Sen. Thad CochranWilliam (Thad) Thad CochranGOP senators ask Trump to hold off on Venezuelan oil sanctions Both sides of the aisle agree — telemedicine is the future Overnight Finance: GOP offers measure to repeal arbitration rule | Feds fine Exxon M for Russian sanctions violations | Senate panel sticks with 2017 funding levels for budget | Trump tax nominee advances | Trump unveils first reg agenda MORE (R-Miss.) and state Sen. Chris McDaniel.

McDaniel held a 1,400-vote edge after Tuesday night's primary with nearly all precincts reporting and just a small portion of mail and provisional ballots still out.

That was enough for The Associated Press to declare Wednesday that the contest would definitely need a runoff.

Neither candidate topped the 50 percent vote threshold needed to win the nomination outright, with both getting 49 percent of the vote

A third Republican in the primary, realtor Thomas Carey, drew 2 percent, enough to help push the contest to a runoff.

Mississippi political observers agree Cochran may be more vulnerable in the runoff. He'll have to grapple with waning enthusiasm surrounding his candidacy and an expected infusion of cash from national conservative groups looking to boost McDaniel.

If McDaniel wins the nomination, Democrats believe they have a shot at picking up the seat this fall, and have nominated former Rep. Travis Childers as their candidate for the general election.