Indiana's voter turnout was much lower than the previous presidential primary four years ago.
Mourdock says he’s not willing to compromise his principles.
Senator Dick Lugar conceded to Richard Mourdock in a primary-night speech Tuesday.
Indiana Treasurer Richard Mourdock has defeated U.S. Senator Richard Lugar in the Republican primary.
Five Democratic candidates are running in the 9th district primary.
County Clerk Linda Robbins says around 4,000 Monroe County residents participated in early voting this year.
The 2nd district seat is open since Joe Donnelly is running for Senate.
8th District Congressman Larry Bucshon has raised substantially more money than his Republican opponent Kristi Risk.
The 5th district primary has several candidates from both the Republican and Democratic parties.
Senator Dick Lugar faces a tough challenge in the GOP primary there on Tuesday from the state's treasurer, who is running to his right.