The number of Americans who believe -- wrongly -- that President Obama is a Muslim has increased significantly since his inauguration and now account for nearly 20 percent of the nation's population. Those results, from a new Pew Research Center survey, were drawn from interviews done before the president's comments about the construction of an Islamic cultural center near Ground Zero, and they suggest that there could be serious political danger for the White House as the debate continues. The president's religion, like his place of birth, has been the subject of Internet-spread rumors and falsehoods since before he began...