Incumbent Chuck Fleischmann narrowly defeated challenger Weston Wamp in the U.S. House District 3 GOP primary on Thursday.

It's not the first time these two have faced off. Wamp challenged Fleischmann back in 2012 for the seat held by his father, Zach Wamp. Wamp left the office in 2010 to run for governor. Fleischmann won that race.

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This has been a bitter campaign, with shots being fired from both sides and lots of money being spent on television commercials, radio and newspaper ads, and direct mailing.

Wamp has positioned himself as the moderate in the 3rd District. Setting aside the conventional wisdom that primary voters reward extreme candidates, he says the time has come to work with Democrats and put an end to "evil versus good" politics.

Fleischmann has responded that Republicans should not reach out to "ultra-liberal leftists." He has said his opponent "wants to kiss up to" Democrats, and he has suggested Wamp should have run in the Democratic primary.

Wamp is one of the younger candidates, at 27 years old. He founded the tech company incubator, Lamp Post Group in Chattanooga.

Whoever wins tonight will face Democrat Mary Headrick of Maynardville. She's running unopposed tonight.