In it, but not of it. TPM DC

Dem-Turned-GOPer Parker Griffith Loses Republican Primary

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Newscom

Although Griffith was welcomed with open arms into the Republican caucus, his Republican opponents did not back out -- Brooks and Phillip had already been running to take on the Democrat Griffith. And Republican primary voters have agreed with their decision. Brooks, who had the endorsement of local Tea Party activists and Griffith's 2008 opponent, Wayne Parker, was able to dislodge the incumbent pretty easily.

Brooks very clearly harnessed the same distrust of an incumbent party-switcher that Joe Sestak seized on in Pennsylvania against Arlen Specter. Check out this ad that Brooks ran, in which Wayne Parker declared: "It's time for a Congressman we can trust."