 CNN's poll conducted after the debate found that 58% of those surveyed thought that Obama had won and 31% felt McCain had won.In CBS's poll of uncommitted voters, 53% felt Obama had won and 22% thought McCain had won, Obama's largest margin of victory of the three debates.A Politico poll of undecided voters, conducted over a 15-minute period following the completion of the presidential debate, showed that 49% felt Obama won, while 46% believed McCain won the debate.