It's caucus day in Iowa

Ahead of the caucus
Volunteer Robert Lark of Pennsylvania knocks on a door while canvassing a neighborhood with campaign material Dec. 31, 2007 in Des Moines, Iowa. Lark was part of a number of volunteers urging Iowans to caucus for Democratic presidential candidate former U.S. Sen. John Edwards during Thursday's Iowa caucus.
Photo by Eric Thayer/Getty Images

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