ERKELEY, Calif., Dec. 6 — Tom Bates, the newly elected mayor of Berkeley, has admitted responsibility for throwing out about 1,000 copies of a University of California newspaper that endorsed his opponent. The newspapers were discarded last month at Sproul Plaza, the site of noted campus protests in favor of free speech in 1964.Mayor Bates, 64, a Democrat who was one of the most liberal members of the State Assembly for two decades, was elected on Nov. 5, a day after The Daily Californian, the free student newspaper at the university, endorsed the incumbent mayor, Shirley Dean, for a...