Indiana's Senate race is officially in a dead heat

Sen. Joe Donnelly (D-Ind.) is still holding onto his hotly contested Senate seat — but barely.

In recent polls, the Democrat has generally fallen close behind his Republican opponent Mike Braun. But an NBC News/Marist poll published Wednesday shows Donnelly with a two-point lead, 48-46, over Braun. Still, that's not a lead Donnelly can be confident in, seeing as the poll's margin of error was 5.5 percentage points for likely voters.

Donnelly has long been seen as a vulnerable Democrat, seeing as President Trump decisively won the state in 2016. Half of the state's voters approve of the president, the poll also showed. Donnelly refused to support Supreme Court Justice Brett Kavanaugh's confirmation, which could be why his chances of winning have dwindled in recent polls, reports RealClearPolitics.

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Democrats would need to hold onto Donnelly's seat if they're looking to flip the Senate this fall, especially since several other red-state Democrats' chances are looking shakier than Donnelly's. There is one positive for Donnelly in this poll: He has 63 percent support among Indianans who've already voted.

The NBC News/Marist poll was conducted from Oct. 24-28 and surveyed 931 Indiana adults, 496 were likely voters. The margin of error is 5.5 percentage points among likely voters.