It doesn’t take much to start a political spat in Ohio, where jockeying for every presidential vote is practically blood sport. The latest pits President Barack Obama’s campaign against groups representing military voters, an uncomfortable place for the commander in chief. At issue is the legality of an Ohio law cutting three days from the early-voting period for everyone, except members of the armed forces and Ohioans living overseas. The dispute reached federal court Wednesday, thanks to what the Obama campaign describes as its first lawsuit anywhere in the nation for the 2012 election. U.S. District Judge Peter Economus in Columbus listened to arguments from both sides but issued no decision. He gave no time frame for a decision, saying only that he would take the matter under advisement. Put simply, both political parties see looser rules for early voting as an advantage for Obama because they might encourage minorities, young people and other harder-to-reach voters to cast a ballot. Military votes are thought to lean Republican.