Photo By Sam Wolson/Special to the Chronicle Elmo lay crumpled in a plastic bag at Fisherman's Wharf in San Francisco. Dan Sandler, the street performer who has become notorious for wearing the furry red costume while posing for photos with children and tourists, decided to forgo the outfit Wednesday - at least while defending himself against accusations that his troubled past made him unfit to depict the beloved "Sesame Street" character. Yes, Sandler said in an interview with The Chronicle, he once ran a pornographic website in Cambodia called Welcome to Rape Camp. Yes, he recently spent time in...