Trump given remaining California Republicans are often quite nativist but not extremely Evangelical in composition.
Western Republicans do have a strain of anti big government, anti eminent domain small government ideology that would play to Cruz better. Trump was a Yankee big city authoritarian.
California isn't Wyoming or Idaho. Even if heavily white rural areas in the far north and interior are disproportionately Republican, the bulk of the voters are to be found in the Southern California suburbs and the Central Valley.
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