Democrats competing to be governor of California said Wednesday evening that they would sign a bill to complete the state’s troubled high-speed rail project . The “ train to nowhere ,” which now costs an estimated $231 billion (seven times the original $33 billion in 2008), and has not laid a single inch of track, has become a national laughingstock. Nevertheless, when asked by moderators whether they would complete the project, Democrats onstage said they would. Former Health and Human Services Secretary Xavier Becerra waffled, and San Jose Mayor Matt Mahan said he would ease regulations first, but none of them called to end it. That summarized the tone of the last televised debate of the campaign, hosted by NBC4 and Telemundo 52, just one night after the candidates clashed for two hours on CNN. This contest — a shorter, one-hour affair — had the feel of an encore, with the candidates trying to score points they missed the night before.…