What’s described as a rare alliance of public and commercial broadcasters will sponsor a debate between Phil Angelides (left) and Steve Westly (right), who are vying for the Democratic nomination for governor. The hour debate will take place at the KPIX CBS 5 studio on May 10 at 7 p.m. and air live on Channel 5, KCBS-AM 740 and public radio’s KQED-FM 88.5. KQED-TV 9 will replay the debate a number of times afterward. KDTV will translate the debate into Spanish and air it May 13 at 10 a.m. “The sponsoring entities have forged a rare alliance of public and commercial broadcasters in order to bring the debate to as many California voters as possible,” said Greg Dalton, chief operating officer of the Commonwealth Club of California, which is sponsoring the debate along with the broadcast stations and the Chronicle.