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 BoehnerSudan sanctions spur intense lobbying OPINION | GOP's 7-year ObamaCare blood oath ends in failure A simple fix to encourage bipartisanship in the House 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 McConnellMitch McConnellParliamentarian deals setback to GOP repeal bill OPINION | How Democrats stole the nation's lower federal courts Flight restrictions signal possible August vacation for Trump MORE (R-Ky.).

Updated at 2:11 p.m.