Monroe County Commissioner Mark Stoops says he will seek to fill the Senate seat being vacated by Vi Simpson.
Sen. Dick Lugar is most known for his contributions to foreign policy.
Mourdock says he’s not willing to compromise his principles.
Indiana Treasurer Richard Mourdock has defeated U.S. Senator Richard Lugar in the Republican primary.
Senator Richard Lugar is continuing to battle Treasurer Richard Mourdock for the Republican nomination.
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.
Richard Lugar and Richard Mourdock have run a fierce campaign against each other. The results of the campaign will come during Tuesday's primary.
A poll by a Republican and Democratic pollster shows Richard Mourdock with a large lead over incumbent Senator Richard Lugar.
Some Republicans say a mailer in support of Senator Richard Lugar encourages Democrats and independents to vote in the Republican primary.
Term Limits America says the six-term Senator Richard Lugar has been in office too long.