He was to attend two "victory rallies" in Florida today with a number of high-profile conservatives, including former secretary of state Condoleezza Rice and Sen. Marco Rubio.
Obama was to return to campaigning Thursday with events in Green Bay, Wis., Las Vegas and Boulder, Colo.
Meanwhile, Romney and conservative Super PACs were spending big in the Democratic-leaning states of Minnesota, Pennsylvania and Michigan.
Republicans said Romney's slim lead in nationwide polls gave them the opportunity to go after Obama in blue-leaning states, which the president did not yet have fully locked up. The Democrats, however, said Republicans were spending money in blue-leaning states because the swing states were already saturated with political ads, and buying new ads would be prohibitively expensive for outside groups.