A new Gravis Marketing poll shows incumbent Indiana Democratic Sen. Joe Donnelly leading Republican businessman and former Indiana state Rep. Mike Braun by 4 points.
What are the details?
The poll revealed that 44 percent of likely voters support Donnelly, and about 40 percent back Braun.
Libertarian Lucy Brenton polled at about 7 percent, and 10 percent of respondents say they are undecided.
The poll of 377 registered Indiana voters was conducted Oct. 12-16 and has a margin of error of 5.1 percentage points.
Seventy-six percent of respondents say they are "very likely" that they will vote in the upcoming election. Thirteen percent of respondents say they are "likely" to vote in the upcoming election, and 11 percent of respondents say they are "somewhat likely" to vote in the general election.
Trump officially endorsed Braun in September during a campaign rally in Evansville, Indiana.
Donnelly and Braun's final debate is set for Oct. 30, and the general election will be Nov. 6.