National Review goes into more depth here:
Much foolishness has become attached to the question of President Obama’s place of birth, and a few misguided souls among the Right have indulged it. The myth that Barack Obama is ineligible to be president represents the hunt for a magic bullet that will make all the unpleasant complications of his election and presidency disappear. We are used to seeing conspiracy theories from the Left, for instance among the one in three Democrats who believe that 9/11 was an inside job conducted with the foreknowledge of the Bush administration. We’ve seen everything under the sun blamed on Dick Cheney and Halliburton, and Rosie O’Donnell has given us much mirth with her metallurgical expertise, while Andrew Sullivan has beclowned himself and tarnished the good name of The Atlantic with his investigation into the “real” parentage of Trig Palin.
I studied and wrote about the 9/11 Truthers for a year; though they had a few supporters in the House (whack jobs like Cynthia McKinney, for example), they were never taken particularly seriously. It’d be nice if the few Republicans we have left in the Congress would stop pussyfooting around and tell their constituents to go get a life when they call the district offices demanding Barack Obama’s ancestry be investigated.