SACRAMENTO (AP) — California's Republican voters have warmed up to the surging candidacy of Rick Santorum but also are expressing growing dissatisfaction with the field of GOP presidential candidates, according to a Field Poll released Wednesday. The former Pennsylvania senator is preferred by 25 percent of the state's registered Republicans, a turn-around that has come partly at the expense of former House Speaker Newt Gingrich, whose support in the state has plunged. Santorum was supported by just 2 percent of California GOP voters in a Field Poll taken last November.