>> ohio, i'm asking you for your vote. and if you're willing to stand with me and work with me, knock on some dors and make some phone calls for me, we'll win franklin county again. we'll wib ohio again. we'll win this election again. we'll finish what we started. >> that was president obama's argument to voters on the last day of voter registration in ohio. ohio is a must-win state for mitt romney as you have heard countless times. no republican has won the presidency without winning ohio. and for mitt romney today it's all about 47%. a new cnn poll shows president obama leading mitt romney among likely voters in ohio, 51% to 47%. president obama invoked a different 47% campaigning in ohio tonight. >> you know, it's interesting. in 2008, 47% of the country