As he campaigned for California governor, Xavier Becerra reflected on the way his Catholic upbringing informs his politics. “The sanctity of life is something that’s really ingrained in you,” the Democrat and former U.S. health and human services secretary said earlier this year.

He then explained his rationale, confounding to some, for supporting abortion rights. Becerra exemplifies how Catholicism’s deep roots often go hand in hand with California’s progressive reputation. That complexity is a snapshot of a larger reality — that American Catholics are in many ways a politically mixed bag.

“There is no Catholic vote,” said David Gibson, the director of Fordham University’s Center on Religion and Culture. White evangelicals for Republicans or Black Protestants for Democrats are more politically reliable religious groups, he said.

With Becerra’s win this week, California has elected five consecutive Catholic governors — a remarkable streak indicative of Catholicism’s enduring influence.…