The top seven contenders in a crowded and highly competitive race to become California’s next governor will face off in a CNN debate Tuesday at 6 p.m. PT (9 p.m. ET).

With less than a month until Election Day, seven California gubernatorial candidates are set to take the debate floor — again.

A proposed tax on the state’s billionaires that will likely be on the November ballot and single-payer healthcare continued to show sharp contrasts between the five Democratic candidates — former Heal...