INDIANAPOLIS (AP) -- U.S. Rep. Todd Young kept an Indiana Senate seat in Republican hands by defeating Democrat Evan Bayh, handing the former two-term senator and two-term governor his first election defeat.

"Tonight, Indiana voted for change in Washington, they voted to send in Marines. Well, I'll tell you, this Marine is humbled. I'm proud to have earned your trust, your confidence and your support," Young said in his acceptance speech. "We're not going to let you down. I'm so humbled by the history of this moment.

"Tonight Hoosiers, we together, have once again proven that democracy works."

Young, a three-term congressman from southeastern Indiana, will succeed retiring Republican Sen. Dan Coats, who won the seat six years ago after Bayh said he decided not to seek re-election because he was tired of Washington partisanship and gridlock. Young was the heavy favorite to keep the seat in GOP hands in the reliably red state until Bayh's surprise announcement July 13 he would run. He made the decision following a recruitment push by national Democrats to help in the effort to try to regain control of the Senate.

Bayh announced he was running two days after former U.S. Rep. Baron Hill withdrew as the Democratic nominee.

"I've been so blessed with just so many wonderful supporters, the countless volunteers across the state of Indiana and of course, most of all, my fellow Hoosiers, who have given me the defining experience of my life serving you for 22 years," Bayh said.