FILE - In this Jan. 16, 2012 file photo Republican presidential candidates former Pennsylvania Sen. Rick Santorum counters former Massachusetts Gov. Mitt Romney, right, during the South Carolina Republican presidential debate in Myrtle Beach, S.C. Remember Newt Gingrich calling Romney a liar? Michele Bachmann saying Romney's unelectable? Santorum calling Romney "the worst Republican in the country" to run against Obama? They're hoping you don't. And acting like it never happened _ even though most of their words are just clicks away online. (AP Photo/Charles Dharapak, File)