The story

The general election season opens with a neck-and-neck race between Barack Obama and John McCain, with more than one in five voters acknowledging that they might change their minds between now and November.

In the CNN/Opinion Research Corporation poll, the first conducted entirely after Obama became the presumptive Democratic nominee, he leads his Republican counterpart 49 percent to 46 percent among registered voters -- a statistical tie, given the question's 3-point margin of error.

McCain and Obama aren't alone. Independent candidate Ralph Nader and Republican-turned-Libertarian Bob Barr are vying with the two major-party candidates for independent voters. Read full article »

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