Voters line up outside the Madison city clerk's office to be among the first to cast ballots early for the Nov. 6 election on Monday, Oct. 22, 2012, in Madison, Wis. Wisconsin is one of just nine states where both President Barack Obama and Republican Mitt Romney are campaigning heavily as the election nears. (AP Photo/Scott Bauer)

Poll: Most Democrats and Republicans Want Open Primaries

Who would benefit more if state primaries were opened, Bernie Sanders or Hillary Clinton?

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