Presidential Campaign Trails (in chronology)

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(L-R) U.S. Presidential hopeful Sen. Barack Obama (D-IL) speaks to a crowd gathered in Chariton, Iowa, on Nov. 08, 2007; and Donald Davis, next to his wife, Alice Davis and a friend, Judy Manning, from Wayne, Iowa, listen to U.S. Presidential hopeful Sen. John Edwards (D-NC) speak at a roundtable discussion with undecided caucus-goers on December 29, 2007, in Washington, Iowa. (Photo by: Yana Paskova for The New York Times)