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Early voters cast their ballots at the Hamilton County Board of Elections in Ohio. Chris Turner/CNN
A 24-hour voting sign hangs outside the Hamilton Board of Elections building. Chris Turner/CNN
Volunteers at a Romney phone bank in the northern part of Hamilton County make calls asking for support for the former Massachusetts governor ahead of the November 6 election. Chris Turner/CNN
At one of the eight Obama campaign offices in Hamilton County, a volunteer makes calls to supporters to come out and canvass. Chris Turner/CNN
Billboards across Hamilton County warn citizens of the consequences of committing voter fraud. Chris Turner/CNN