725 Ohio adults were interviewed by SurveyUSA 10/12/08 and 10/13/08. Of them, 671 RV were registered to vote. Of them, 575 were determined by SurveyUSA to have already voted, or to be likely to vote on or before election day. Of the 12% of respondents who tell SurveyUSA they have already voted, Obama leads by 18. Of the 88% of respondents who tell SurveyUSA they are certain to vote before the deadline, Obama leads by 4. Ohio has 20 Electoral College votes. George W. Bush carried Ohio by 2 points in 2004 and by 4 points in 2000.