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Each Democrat made a 30-second video of his own, with Mr. Dodd saying he has white hair because of his years of hard work as a senator, and Mr. Biden solemnly presenting himself as the most qualified to end the war in Iraq.

Mrs. Clinton ended her video with this phrase on a written cue card: “Sometimes the best man for the job is a woman.”

The Edwards video, titled “Hair,” was the best-received. Set to theme song from the famed 1960s musical “Hair,” it played on embarrassing headlines revealing the former senator had gotten a $400 haircut and showed competing images of hair and scenes from Iraq and the aftermath of Hurricane Katrina. It closed with “What really matters? You choose.”