In the polarized political environment, age, too, marked a division. About 1 in 10 under age 35 gave him good marks personally and in his job, and only 15 percent approved of his policies, contributing to lackluster 26 percent support across the state for his policies.
Trump's unpopularity has led to fierce infighting among Democrats about how and whether to cooperate with his administration -- something rarely considered optional during past presidencies.
Amid a range of California voters, the answer was ambivalence.
More than 3 in 5 California voters disagreed with the president's policies, but a smaller 53 percent said elected representatives should never cooperate with Trump.
Almost 9 in 10 Democrats disagreed with Trump's policies, but 42 percent of them said members of Congress should try to work with him, compared with 58 percent who said they should not.
Opposition to working with Trump was fiercest among Latinos, those under 35 and those making less than $50,000 per year. Close to two-thirds of those groups preferred that their representatives stiff-arm the president.
Disagreement followed on the question of whether California officials should cooperate with Trump's immigration policies.
Overall, only 21 percent said California should cooperate completely with Trump's immigration policies, and 19 percent said California should cooperate most of the time. Sentiment against cooperation was more extreme, with 33 percent saying the state should never cooperate and 27 percent saying it should not cooperate most of the time.
But the responses differed sharply by political affiliation -- 86 percent of Republicans favored cooperation, while only 16 percent of Democrats did. Nonpartisan voters were in the middle, with 43 percent saying cooperation should occur all or most of the time.
Part of the reluctance flowed from the multiethnic makeup of California, where Latinos have become a powerful voting bloc and Asian voters, also often affected by immigration policies, are growing in prominence.