No rest for the campaign weary: Obama is traveling about 5,300 miles today with attempts to win over voters in Iowa, Colorado, a stop in California to talk to Jay Leno, then a stop in Las Vegas before an overnight trip to Florida. Ben Feller of the Associated Press calls it the "busiest single day of his re-election bid." 

According to the White House schedule, Obama started four-time-zone tour at 8 a.m. Eastern Time when he left the White House for Joint Base Andrews to fly to Davenport, Iowa, where he held a campaign event. He departs at 1:15 p.m. Central Time to head to Denver for another campaign event. He leaves at 4:20 p.m. Mountain Time for Los Angeles, where he arrives at 5:25 p.m. Pacific Time to get to a taping of The Tonight Show with Jay Leno at 6:30 p.m. But he doesn't linger. He's due in Las Vegas at 8:45 p.m. for another rally, this time with Katy Perry singing. His day of travel is still not over. Obama then will leave Las Vegas a little before midnight Pacific Time for Florida, and will spend the night on Air Force One. Feller says this is the first time the President has flown overnight for a domestic trip.

On Thursday Obama will be in Florida, Virginia, Ohio and Illinois, where he'll vote early.

Romney is hitting Nevada and Iowa today, before arriving in Ohio tonight.  

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Esther Zuckerman