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The radio ad asks "liberal Mark PryorMark PryorCotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm Top Democrats are no advocates for DC statehood MORE" why he voted for ObamaCare and says he wants to "hide his record in Washington" and voted with President Obama 95 percent of the time.

It then directs listeners to pryorforobama.com, the group's new website.

The Club has been a major backer of Rep. Tom CottonTom CottonArk., Texas senators put cheese dip vs. queso to the test Overnight Defense: Debate over Mattis heats up | White House releases military force rules Senate GOP to Obama: Stop issuing new rules MORE (R-Ark.), Pryor's likely general election opponent, since his 2012 House primary. The race is one of the few where establishment Republicans and Tea Party groups like the Club agree on a GOP candidate. Pryor is widely viewed as the Democratic senator facing the toughest reelection battle this election cycle.

Pryor is up with a new website of his own, cottonfacts.com, that says Cotton "supports spending taxpayer billions in Syria while he votes to cut Medicare, Social Security and school lunches here at home."