A voter enters the polling station at the Alcazar Hotel in Cleveland Heights, Ohio to vote in Ohio's primary election on Tuesday, March 4, 2008. Barack Obama sought a knockout against rival Hillary Rodham Clinton as voting began Tuesday in crucial contests in Texas and Ohio, where the former first lady desperately needed a win to salvage her once-powerful candidacy for the Democratic presidential nomination.
(Photo: AP Photo/Amy Sancetta)
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