An obscure Ohio voting law is suddenly at the center of a nasty dispute between the Obama and Romney campaigns — months before Election Day, in a case that underscores how the campaigns are poised to fight for every last vote.

The Obama campaign says its court challenge to Ohio’s policy is about basic fairness. The campaign objects to the state’s two-tiered system allowing members of the military to participate in early voting until the Monday before Election Day, while everybody else faces a Friday deadline.

But there’s no denying the dispute is rich with political implications. In a close race, the campaigns are preemptively fighting over a contest that could hold electoral sway akin to Florida’s in 2000.

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