Mac Collins made clear at the Georgia GOP convention this weekend he would forgo a primary challenge to incumbent U.S. Rep. Paul Broun (GA-10).

Collins, himself a member of Georgia’s Congressional delegation until 2005, said he was considering until just 10 days ago the prospect of returning to D.C.

But early and sustained broadsides by conservative advocacy groups may have weighed heavily on his calculus.

“Mac Collins voted to increase the debt limit four times, resulting in our national debt increasing by billions,” Chris Chocola, who steers the conservative Club for Growth, in a January research dump. “He voted for No Child Left Behind, and three times to raise his own pay. We don’t need another big government Republican in Congress like Mac Collins, we need more pro-growth fighters for limited government like Paul Broun.”

Even with the Club in his corner, Broun has still drawn a challenger: ex-Air Force Lieutenant Colonel Stephen Simpson — “a patriot, not a politician” his website reads — declared against the Athens Congressman in October last year.

Broun is slated to kick off his reelection bid next week with a 5-day, 25-county bus tour of the 10th. The wired launch begins Monday 8:30 at Athens coffee house Jittery Joe’s.

– James Richardson