PANAMA CITY, Florida (Reuters) – President Barack Obama on Saturday backed off remarks that appeared to endorse a proposed Muslim cultural center near the site of the September 11, 2001, attacks in New York City, saying he only supported the organizers' right to build it. At a White House event on Friday, Obama seemed to offer his support for the construction of Cordoba House near the site known as "Ground Zero" in lower Manhattan. U.S. conservatives and many New Yorkers object to the project. The 13-story building will include meeting rooms, a prayer space, an auditorium and a swimming pool....