A liberal super-PAC is gearing up to defeat Reps. Dan Lungren (R-Calif.) and Mike Fitzpatrick (R-Pa.), two vulnerable Republicans.

CREDO super-PAC will will set up offices and hire four full-time staffers in each district.

Lungren faces a tough race against Dr. Ami Bera, a physician, while Fitzpatrick is being challenged by attorney Kathy Boockvar. Both are top Democratic targets.

The group plans to raise and spend $3 million in total against 10 Republicans, and has already announced it will target GOP Reps. Steve King (Iowa), Joe Walsh (Ill.), Allen West (Fla.), Frank Guinta (N.H.) and Chip Cravaack (Minn.), all of whom they claim are beholden to the Tea Party and out of step with their districts.