The Club has already begun airing ads ripping Simpson’s record.
"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 BoehnerDem drops out of race for Boehner's old seat Conservative allies on opposite sides in GOP primary fight Clinton maps out first 100 days 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 McConnellPeter Thiel does not make the GOP pro-gay Reid: Trump is a 'hateful con man' McAuliffe: Clinton won't move TPP without changes MORE (R-Ky.).
Updated at 2:11 p.m.