In Ohio, Early Voters May Give Obama Enough Running Head Start That McCain Can't Catch Him on Election Day: Barack Obama 48%, John McCain 46%, in SurveyUSA's final tracking poll released Election Eve. Obama leads 5:3 among those who have already voted. McCain leads 5:4 among those who have not yet voted. Obama led in the past 3 SurveyUSA tracking polls, but by tapering margins. Obama led by 5 on 10/14/08, by 4 on 10/28/08 and by 2 today. It is possible that McCain could overtake Obama in the final 24 hours, but that would require young voters to stay...