He didn't have to prove that to racist morons like

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The McCain Investigation. The McCain campaign probed the rumors and dismissed them. Trevor Potter, general counsel of the campaign, told The Washington Independent’s David Weigel: “To the extent that we could, we looked into the substantive side of these allegations…We never saw any evidence that then-Senator Obama had been born outside of the United States.

We saw rumors, but nothing that could be sourced to evidence. There were no statements and no documents that suggested he was born somewhere else. On the other side, there was proof that he was born in Hawaii.

There was a certificate issued by the state’s Department of Health, and the responsible official in the state saying that he had personally seen the original certificate.

There was a birth announcement in the Honolulu Advertiser, which would be very difficult to invent or plant 47 years in advance.”

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