The Tea Party is hoping for a big win in today's Indiana primary as six-term Sen. Richard Lugar is locked in a tight battle against Tea Party favorite, Indiana State Treasurer Richard Mourdock.
Critics call the 80-year-old Lugar a moderate, citing a record of questionable votes, including supporting President Obama's stimulus bill and his picks for the Supreme Court.
Lugar disputes that characterization.
"I had the highest voting record percentage of support of Ronald Reagan for eight years of any Republican in the Senate. Any of them," he told CBN News.
Mourdock, who has been endorsed by Sarah Palin, positions himself as the more conservative challenger.
"This race is for the heart and soul of the Republican Party in the United States Senate," Mourdock said.
Both candidates say they have the support needed to win. But political observers say it will be close.
Mourdock's momentum started growing a few months ago when outside groups helped his campaign buy ads attacking Lugar's voting record, painting him as a Washington insider who no longer maintains a residence in Indiana.