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The developments come just as hundreds of federal observers have fanned out across the country to monitor elections and polling places in 23 states, including closely watched Ohio, Pennsylvania and Florida.

Government officials, lawyers from both parties and watchdog groups are looking for irregularities the could tilt the outcome of the most expensive presidential election in history.

The Committee of Seventy, an election watchdog group in Philadelphia, said Tuesday there was much confusion at polling places in Philadelphia and its suburbs about the voter ID law. It said many polling sites around the region were distributing old information indicating that voters must produce ID to vote.