Obama to pull 'all-nighter' for key battleground votes

President Barack Obama will embark on a whirlwind tour of battleground states Wednesday in Iowa before becoming the first sitting president in modern history to cast an early ballot in-person.

On the "non-stop" tour, Obama will rally supporters and volunteers in key swing states and try to appeal to undecided voters. The president will make phone calls to undecided voters while aboard Air Force One in between his tightly packed schedule of campaign stops.