SACRAMENTO, Calif. (AP) — The leading candidates for California governor clashed in a lively debate Tuesday on everything from a proposed tax on billionaires to state-funded healthcare for immigrants in the country illegally. The debate, broadcast on CNN, was one of their last chances to pitch themselves to voters and stand out from the pack in their primary election bids to succeed Democratic Gov. Gavin Newsom, who terms out in January. Mail voting is already underway, and voters have until June 2 to cast their ballots. The top two-vote getters will advance to the general election in November, regardless of party. Though California hasn’t had a Republican governor in more than a decade, the specter hangs over the race as the field is still crowded with less than a month to go.…