One of Barack Obama's staunchest supporters and prized campaigners and film biographers from the motion picture and television business has just been accused of union busting, according to a complaint filed Thursday with the National Labor Relations Board. Before the exposé, writer/actor/director/producer Tyler Perry invited the presidential candidate to the grand opening of his entertainment studio on the outskirts of Atlanta, Georgia, this coming Saturday night. But if Obama attends he will be met by picket lines thrown up by the Writers Guild of America with support from other unions including the Teamsters, even though the latter union has officially endorsed the Democrat. "This is just the first step. We've got a lot more planned," a WGA insider told me last night, indicating that the Perry picketing may widen to Time Warner's TBS and Warner Bros which broadcasts his hugely popular House Of Payne sitcom, and an upcoming TV spinoff of one of Perry's movie's Meet The Browns.