It’s hard to tell whether Joan Rivers was joking when she said that President Obama is gay. “Everybody knows,” she said. It happened Monday in New York as Rivers entered a bookstore to officiate at the gay wedding of two fans. She’s in the midst of promoting her new book, Diary of Mad Diva, so maybe she thinks this will help? Then again, it might just be par for the usual Rivers course: Offending is her comedic stock in trade, with a history of edginess too extensive to list here.