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One of the big issues for Democrats this year is health care. But the race to succeed Gov. Jerry Brown is showing what a divisive issue that is as Democrats chart the party’s future. It’s not just about Obamacare versus Trumpcare.

Four Democratic candidates for governor demonstrated that Thursday night before an audience of hundreds gathered in San Diego for a state party convention that will test how divided California Democrats are heading into critical midyear elections.

Talk of single-payer health care at the debate — sponsored by the San Diego Democratic Party — drew some of the biggest cheers of the night.

“It’s a fundamental issue in this campaign,” said Gavin Newsom, the lieutenant governor and a strong proponent of single-payer health care. “With respect to some of the others on this stage, I don’t sense that they are as committed to single-payer as they are saying.”