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 BoehnerGOP revolts multiply against retiring Ryan Can Jim Jordan become top House Republican? Tensions on immigration erupt in the House GOP 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 McConnellGOP lawmakers want Trump to stop bashing Congress Parkland father calls out Trump, McConnell, Ryan after Santa Fe shooting Overnight Finance: House rejects farm bill in conservative revolt | NAFTA deal remains elusive as talks drag on | Dodd-Frank rollback set for House vote MORE (R-Ky.).

Updated at 2:11 p.m.