Joe Donnelly remains one of the most vulnerable Senate Democrats on the ballot this year, but the nasty GOP race to decide who will challenge him has buoyed Democratic confidence that he could survive.

Braun emerged the victor Tuesday from a bruising Republican primary against U.S. Reps. Luke Messer and Todd Rokita.

Their race has been dubbed one of the nastiest in the country. It's a campaign where attacks have been many, while policy differences are few.

Indiana Public Broadcasting's Brandon Smith discussed the GOP primary campaign with U.S. Rep. Todd Rokita.

The final debate between Republican U.S. Senate candidates Mike Braun, U.S. Rep. Luke Messer (R-Greensburg) and U.S. Rep. Todd Rokita (R-Brownsburg) was focused almost entirely on attacks between each candidate.

Indiana's three Republican U.S. Senate candidates - Reps. Luke Messer and Todd Rokita, and businessman Mike Braun - will meet Monday for the debate hosted by the Indiana Debate Commission.

Indiana's three Republican U.S. Senate candidates - Reps. Luke Messer and Todd Rokita, and businessman Mike Braun - met for the final debate before the May 8 primary.

Two sitting congressmen and a former state lawmaker are locked in tight competition for a chance to unseat Democrat Joe Donnelly in November.

Candidates Todd Rokita, Luke Messer and Mike Braun explored common ground through much of the evening.

The campaign has demanded Rep. Todd Rokita take down yard signs it says give the false impression the president endorsed Rokita's Senate bid.