The Club has already begun airing ads ripping Simpson’s record.

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"As one of the chief appropriators in Washington, Rep. Mike Simpson has never seen a wasteful program he did not want to fund," said Daniel Horowitz, a spokesman for the Madison Project. 

"From funding the controversial ACORN, sex education, government-run healthcare, bailouts, and corporate welfare, Congressman Simpson has made a career out of frivolously spending taxpayer money.  Most importantly, he continues to refuse to join the current conservative effort to defund ObamaCare."

Simpson, a centrist in a heavily Republican district, has faced primary challengers before and was held to 58 percent by two underfunded challengers in 2010.

Smith appears to be his biggest challenge to date, and has gotten off to a quick fundraising start

BoehnerJohn Andrew BoehnerFreedom Caucus members see openings in leadership Five GOP lawmakers mulling bid to lead conservative caucus Ex-lawmakers see tough job market with trade groups MORE has already stepped in to help Simpson, a close friend who is reliable vote for the sometimes embattled Speaker.

He traveled to Boise, Idaho in late August for a $50-a-plate fundraiser for the congressman, and has donated the legal maximum of $5,000 to his friend’s reelection campaign.

The Madison Project, which spent $1.8 million during the 2012 election cycle, has a history of backing primary challengers to GOP incumbents.

It is also supporting conservative Matt Bevin, the primary foe challenging Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellPelosi: 'Thug' Putin not welcome in Congress GOP to White House: End summit mystery Sunk judicial pick spills over into Supreme Court fight MORE (R-Ky.).

Updated at 2:11 p.m.