BURBANK, Calif. (AP) - Christian Brando, the son of actor Marlon Brando, took the witness stand Tuesday in Robert Blake's civil trial but declined to answer key questions to protect himself from possible self-incrimination. Brando's lawyer, Bruce Margolin, stood next to him at the witness box and repeatedly invoked the Fifth Amendment on behalf of his client. Brando, 46, has been a key figure in the case surrounding the murder of Blake's wife, Bonny Lee Bakley. Blake's lawyers have pointed at him as a possible suspect in the slaying. Brando has not been arrested or charged. On the witness stand,...