Arraignment of former U.S. Sen. John V. Tunney on a misdemeanor drunk driving charge was postponed until April 28 after his attorney said he needed more time to confer with the 52-year-old California Democrat. The California Highway Patrol said Tunney was arrested on March 6, when he was allegedly speeding and weaving in his 1985 Mercedes-Benz on Pacific Coast Highway in Santa Monica. Officers said it was a first offense. Tunney said he had been to a birthday party but that he had little to drink and thought that "I was completely in control of the car and was in no way under the influence of alcohol in my driving." Tunney, a Century City attorney and a commentator for KABC-TV, served a single term in the Senate.