On the final stop of a pre-convention campaign circuit of several battleground states, the president also dropped off a case of White House-brewed beer at a local fire station.
The Republican challenger was in Vermont as the Democratic convention began, preparing for three fall debates with Obama almost certain to be critical to the outcome of the election.
There was no shortage of political calculation behind the program of the convention's first night — or for any other.
Democratic delegates bestow their nomination on Obama and Vice President Joe Biden on Wednesday, the same night former President Bill Clinton delivers a prime-time speech aimed at voters disappointed with the results of the past four years yet undecided how to cast their ballots.
White men favor Romney over Obama in public and private polls, but a Gallup survey taken in July showed that 12 years after leaving office, Clinton was viewed favorably by 63 percent of the same group and unfavorably by only 32 percent.
Obama's acceptance speech caps the convention on Thursday night at the 74,000-seat Bank of America football stadium. Aides kept a wary eye on the weather in a city that has been hit in recent days with strong afternoon rains.
Republicans did their best to rain on Obama's convention, whatever the weather.
Vice presidential candidate Paul Ryan spoke in Westlake, Ohio, standing behind a lectern bearing a sign that read "Are you better off?"
Republicans released a web video that interspersed images of Obama and the economy's weak performance with slightly out-of-focus video clips of former President Jimmy Carter discussing the nation's economic woes when sat in the Oval Office more than 30 years ago.
Matthew Daly reported from Norfolk, Va. Associated Press writers Steve Peoples in Ohio, Kasie Hunt in Vermont, Jack Gillum and Tom Raum in Washington, Thomas Beaumont in Des Moines, Iowa, and Ken Thomas and Matt Michaels in Charlotte contributed.
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