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Barack Obama speaking today at a rally in Manchester, New Hampshire
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Democratic presidential hopeful John Edwards speaks at a Labor Day rally in Pittsburgh, Monday, Sept. 3, 2007. The United Steelworkers and the United Mine Workers of America officially endorsed Edwards at the rally of more than 1,000 union members. (AP Photo/Andrew Rush)
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Democratic presidential hopeful Sen. Hillary Rodham Clinton, D-N.Y., left, speaks during the Woodbury County Labor Day Picnic in Sioux City, Iowa, Monday, Sept. 3, 2007. (AP Photo/Charlie Neibergall)