FILE - In this July 18, 2012 file photo, Republican presidential candidate former Massachusetts Gov. Mitt Romney speaks in Bowling Green, Ohio. Republicans say Romney has a chance to win Wisconsin. Democrats backing President Barack Obama insist Arizona could come into play. But if television ads are any guide, the 2012 contest will be won or lost in just nine states that have seen an eye-popping $350 million in ads so far with few new targets of opportunity expected to emerge. (AP Photo/Evan Vucci, File)

Associated Press
FILE - In this July 18, 2012 file photo, Republican presidential candidate former Massachusetts Gov. Mitt Romney speaks in Bowling Green, Ohio. Republicans say Romney has a chance to win Wisconsin. Democrats backing President Barack Obama insist Arizona could come into play. But if television ads are any guide, the 2012 contest will be won or lost in just nine states that have seen an eye-popping $350 million in ads so far with few new targets of opportunity expected to emerge. (AP Photo/Evan Vucci, File)
FILE - In this July 18, 2012 file photo, Republican presidential candidate former Massachusetts Gov. Mitt Romney speaks in Bowling Green, Ohio. Republicans say Romney has a chance to win Wisconsin. Democrats backing President Barack Obama insist Arizona could come into play. But if television ads are any guide, the 2012 contest will be won or lost in just nine states that have seen an eye-popping $350 million in ads so far with few new targets of opportunity expected to emerge. (AP Photo/Evan Vucci, File)
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