Photo: #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.

Campaign 2008

It's caucus day in Iowa

Broadcast: Midmorning, 01/03/2008, 10:06 a.m.

The Iowa caucuses are earlier than ever this year, and some say Iowa's significance in the presidential race is greater than ever. But will a win in Iowa really propel to the nomination? Midmorning looks at the Iowa caucuses, and beyond, live from Des Moines.

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with Bob Collins