It's Joe Biden, who may be running the most under-the-radar White House campaign of any sitting vice president in modern times. Biden made stops in Iowa, New Hampshire, and South Carolina last month. The appearances were all ostensibly aimed at promoting President Obama's agenda, but as the old axiom goes, no politician visits any of these states by accident, and certainly not in the calendar year before primary voters head to the polls.
user-inactivated:
I think Biden could win. He just has to follow one little rule: