A new poll in California shows Wesley Clark has joined presidential rivals Howard Dean and Joe Lieberman atop a poll of Democratic voters in California. Clark, who entered the race last month, had 17 percent support to 14 percent for Dean, the former Vermont governor, and Connecticut Senator Lieberman. The numbers are all within the Field poll`s margin of error of five percentage points. In early September, Dean led with 23 percent support to just four percent for Clark, who had not entered the race. The new poll found much of Clark`s support coming from men -- 24 percent -- and much of it at Dean`s expense. Clark also was the only Democrat to poll better than President Bush in a head-to-head matchup -- 45 percent to 42 percent.