At the birthplace of the free speech movement, campus radicals have a new target: the faculty that came of age in the 60's. They say their professors have been preaching multiculturalism and diversity while creating a political monoculture on campus. Conservatism is becoming more visible at the University of California here, where students put out a feisty magazine called The California Patriot and have made the Berkeley Republicans one of the largest groups on campus. But here, as at schools nationwide, the professors seem to be moving in the other direction, as evidenced by their campaign contributions and two studies being published on Nov. 18.One of the studies, a national survey of more than 1,000 academics, shows that Democratic professors outnumber Republicans by at least seven to one in the humanities and social sciences. That ratio is more than twice as lopsided as it was three decades ago, and it seems quite likely to keep increasing, because the younger faculty members are more consistently Democratic than the ones nearing retirement, said Daniel Klein, an associate professor of economics at Santa Clara University and a co-author of the study. In a separate study of voter registration records, Professor Klein found a nine-to-one ratio of Democrats to Republicans on the faculties of Berkeley and Stanford. That study, which included professors from the hard sciences, engineering and professional schools as well as the humanities and social sciences, also found the ratio especially lopsided among the younger professors of assistant or associate rank: 183 Democrats versus 6 Republicans.