Presidential Campaign Trails (in chronology)

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(L-R) Volunteers for U.S. Presidential Hopeful Sen. Barack Obama (D-IL) and his rival candidate, Hillary Clinton (D-NY) place signs outside the Iowa Brown & Black Presidential Forum in North High School in Des Moines, Iowa, on Dec. 1, 2007. The forum gathered opposing democratic candidates with a month left until the Iowa caucus. (Photo by: Yana Paskova for The New York Times)