FILE - In this Feb. 11, 2012 file photo, Sarah Palin speaks in Washington. Not it!  Republicans considered to be up-and-comers are scrambling to make it known they have no interest in becoming Mitt Romneys running mate, taking themselves off the still-forming short list of would-be vice presidents. With Romney poised to win the GOP nomination in June _ if not earlier _ some of the focus has shifted to his pick for the number-two spot on his ticket but no one is rushing forward and many of the top prospects are trying to shut down the conversation before it begins.  (AP Photo/J. Scott Applewhite, File)
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