President Barack Obama is challenging Republican Mitt Romney's candor the day after their first debate, saying: "If you want to be president, you owe the American people the truth."

Obama supporter at campaign rally in Denver following debate. (Doug Pensinger/Getty Images)

Obama said at a rally in Denver on Thursday that at the debate he met "this very spirited fellow who claimed to be Mitt Romney." But he says it couldn't have been his Republican rival because he says Romney misrepresented his own position on taxes, education and the outsourcing of jobs.

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In tough comments, the president says Romney, quote, "does not want to be held accountable ... because he knows full well that we don't want what he's selling."

Obama spoke at his first event after Wednesday night's debate. Analysts panned his performance.


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