U.S. celebrates Labor Day

Visitors to CarolinaFest, Charlotte's Labor Day street festival, get caught in a downpour September 3, 2012 in Charlotte, North Carolina. The Democratic National Convention begins tomorrow in Charlotte and runs through Thursday. (Photo by Scott Olson/Getty Images)

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Parades, picnics and politicians celebrated the American worker on Labor Day, with President Barack Obama seeking votes from Ohio union members and rivals for Senate seats marching in Massachusetts and Virginia.

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