This Jan. 31, 2012 file photo shows a woman voting at the Cuyahoga County Board of Elections in Cleveland as early voting began in Ohio's March 6 presidential primary. A dispute over early voting rules in swing state Ohio is playing out in a political spat between the two presidential campaigns and in a federal court battle. At issue is the legality of an Ohio law cutting three days out of the early-voting period for everyone except members of the armed forces and Ohio citizens living overseas. The dispute reaches court Wednesday, thanks to what the Obama campaign describes as its first lawsuit anywhere in the nation for the 2012 election. (AP Photo/Tony Dejak, File)
