President Obama said in an interview Sunday that he can't worry about dispelling every rumor about him — even though a recent poll showed nearly 20% of Americans erroneously believe he is Muslim.

"The facts are the facts, right?" Obama told NBC's Brian Williams in New Orleans, where he was marking the fifth anniversary of Hurricane Katrina. "There is a mechanism, a network of misinformation that in a new-media era can get churned out there constantly.

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