Answer: Mitt Romney.
"Former Governor Mitt Romney raised nearly $175,000 in the final five weeks of 2010 and starts out this year with $1.4 million in the bank, according to newly filed campaign disclosure forms.
His political action committee -- called the Free and Strong America PAC -- begins 2011 with more than any other prospective presidential candidate. Former Alaska Governor Sarah Palin is close, with $1.3 million in her account.
Former Minnesota Governor Tim Pawlenty has nearly $155,000 in his account, while Politico is reporting that former Governor Mike Huckabee has less than $138,000 in his account. Several others, including Mississippi Governor Haley Barbour and former House Speaker Newt Gingrich, had not filed their updated forms by mid-afternoon."
The Boston Globe has more here.