California hasn't had 2 Republican Senators at the same time since 1971. California became Democrat when the Republican Party realigned to the Southern Strategy, not because of campaigning.
Prior to 1992 the only time California had two Democratic senators was post-Watergate and then prior to that single term for Tunney you have to go all the way back to 1863 to get two Dem senators. California had frequently elected Republican governors (including one who went on to become president), had house delegations that were majority Republican for stretches of time, and except for Johnson's win in 1964 CA was a solid batch of electors for the Republican presidential candidate up until Clinton.
CA was a Republican state from the late 19th century up until the 1990s.
