McCain on dizzying schedule, Obama in Ohio

With two days remaining in the hard-fought presidential contest, Republican John McCain set out Sunday on a dizzying campaign charge through three states where victory could yet tip the presidential contest in his favor. Front-running Democrat Barack Obama looked to battleground Ohio to clinch the race. McCain's scrappy closing scramble in what has been America's longest presidential campaign underlines his promise of a come-from-behind victory against Obama, the 47-year-old first-term Illinois senator who would be the country's first African-American president. A victory for the four-term Arizona senator would mark a true upset given Obama's solid lead in most national and key state polls. An Associated Press-Yahoo News national survey of likely voters put Obama ahead, 51 to 43, with a margin of error of plus or minus 3 percentage points. The Gallup Poll tracking survey calculated Obama's margin at 10 percentage points, 52-42. As Obama focused on Ohio's three major cities, including an appearance in Cleveland with singer Bruce Springsteen, McCain was dashing from Pennsylvania to New Hampshire and then to Florida for a late night rally.