Undecided voters

“These undecided voters, called "the persuadables" by the campaigns, represent about 6 percent of the electorate, according to recent polls. About 19 percent of voters said there was a chance they could change their minds, according to a Washington Post/ABC News poll last month. That's compared with about 10 percent undecided and 25 percent who could still have changed at this point in 2008.”

http://www.businessweek.com/ap/2012-08-18/obama-romney-compete-for-undecideds-stoke-base

Wisconsin

Poll:  “Obama led among registered voters, 49-45 percent. Among all voters, he was up 6.”

http://blogs.mcclatchydc.com/washington/2012/08/romneyryan-ticket-trails-in-ryans-wisconsin.html#storylink=cpy