Congressman Todd Young will be the GOP's standard-bearer in the general-election battle for the U.S. Senate.
With 35 percent of precincts reporting in Tuesday's primary, the Associated Press called Young's victory over his fellow U.S. Representative, Marlin Stutzman, by a margin of 65-to-35 percent.
Young ended up with 65 percent of the vote.
"Together, we can ensure that Indiana is the first state on the board to elect a Republican president of the United Staets and keep this Senate seat in Republican hands," Young said in his victory speech. "You have my word, I'll do my part."
Stutzman said despite the loss, he is committed to working for Indiana.
"While we didn't get the outcome that we wanted tonight, we just know that going forward we still have a responsibility to stay in the fight," Stutzman said.
Young's name almost did not make the ballot when Democrats claimed Young did not have the required number of voter signatures and filed a challenge February with the Indiana Election Commission. The Commission's split 2-2 decision allowed Young's name to remain on the ballot.
Young will face Baron Hill, who ran uncontested in the Democratic primary, in the November general election.
Hill, a five-term U.S. Representative in Indiana's 9th District, was defeated by Young in 2010.