It's now looking like a lot of prominent Republicans, ranging from party leaders to big-name pundits that we usually expect to make outrageous partisan attacks, are doing something they'd been previously neglecting: Definitively cracking down on the Birthers, rather than playing to the conspiracy theorists allowing this stuff to continue festering.
Source:
http://tpmdc.talkingpointsmemo.com/2009/07/republicans-stepping-away-from-the-birthers.php