Scott Colom, the Democratic nominee, has kept his edge over the Republican incumbent, Cindy Hyde-Smith, as more provisional and mail ballots were reported throughout the state.
A phalanx of lawyers, observers and campaign officials are watching the counting of votes in the race for Senate, where a Democratic challenger has a slim lead.
Democrats in the South used anger over redistricting, cuts to key federal programs and attacks on Black history to help galvanize a crucial bloc of voters to the polls.
They won Senate races in North Carolina, South Carolina and Georgia, with a Mississippi race still too close to call. Their wins lifted down-ballot candidates too.
Scott Colom, a Democrat, ran a viral ad and courted Republicans at a Trump rally before winning virtually the same number of votes as Senator Cindy Hyde-Smith, a Republican.
President Trump on Monday was the latest big political star to swing through Mississippi and boost a candidate in a red-state Senate race that suddenly seems competitive.
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