CNNW John King USA February 28, 2012
>> and the two frontrunners in a bitter duel with a lot to prove and a lot to lose. >> tonight mitt romney's toughest test since rick santorum's surge. >> if you want a fiscal conservative, you can't vote for rick santorum because he's not. >> does the word "hypocrisy" come to mind? >> it's a two-state showdown with one frontrunner trying to avoid an embarrassing defeat. >> governor romney is discovering you cannot take your home state for granted. >> will romney prove his staying power or will he suffer a crippling setback in michigan or arizona? it's america's choice. santorum clim...