Poll Tracker

Barack Obama and John McCain are locked in a close contest according to a CNN/Opinion Research poll conducted June 26-29, with Obama ahead 50 percent to 45 percent. The margin of error is 3.5 percent. A month ago, Obama's slim edge was 3 points. When the third party candidates - Ralph Nader and Libertarian Bob Barr - are factored in, Obama's lead is 46 percent to 43 percent with Nader drawing 6 percent and Barr 3 percent. But polling director Keating Holland expects the Barr and Nader figures to decline as election day nears.