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The radio ad asks "liberal Mark PryorMark PryorMedicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm 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 CottonOvernight Finance: GOP criticism of tax bill grows, but few no votes | Highlights from day two of markup | House votes to overturn joint-employer rule | Senate panel approves North Korean banking sanctions GOP senator: CBO moving the goalposts on ObamaCare mandate Cruz: It’s a mistake for House bill to raise taxes 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."