Clues to Obama-Romney Outcome Lie in Three Eastern States

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The 2012 presidential election could be effectively settled shortly after 8 p.m. Eastern Standard Time, when all polls will have closed in three of the biggest battleground states: Florida, Virginia and Ohio.

Quick projections of a sweep of these competitive states by either President Barack Obama or Republican Mitt Romney probably would mean that candidate will win the White House. If there’s a split decision or if some of these races remain unsettled for hours, the election’s outcome could stretch into tomorrow. Challenges to ballot tallies -- like in Florida in 2000 -- could delay the call for days or weeks.