WASHINGTON — Americans need only stand in line at the grocery checkout counter to glimpse the conspiracy theories percolating about President Obama. “Birthplace Cover-Up,” screams the current issue of the racy tabloid Globe. “Obama’s Secret Life Exposed!”

The article claims, without proof, that Mr. Obama uses a phony Social Security number as “part of an elaborate scheme to conceal that he is not a natural-born U.S. citizen.” Despite evidence to the contrary from Obama aides — they posted his birth certificate, from Hawaii, on the Internet during his presidential campaign — polls show that as many as one quarter of Americans still believe Mr. Obama was born outside the United States.

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