President Barack Obama has expressed publicly for the first his frustration with conservative opponents who have persisently questioned his Christianity and his eligibility for the office he holds.

Mr Obama, referring to the conspiracy theory that he was born in Kenya and not Hawaii, said in a television interview: "I can't spend all of my time with my birth certificate plastered on my forehead. The facts are the facts. We went through some of this during the campaign - there is a mechanism, a network of misinformation that in a new media era can get churned out there constantly."

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