California has voted Democrat nearly every time since WWII. (1984 was an exception.)
Err, not really, no. After WWII and before Bill Clinton, the
only times California awarded its electoral votes to the Democratic candidate was Truman in 1948 and during LBJ's rout against Goldwater in 1964. It helps that during seven of these elections there was a Republican on the ticket, of course (Nixon in 1952, 56, 60, 68, and 72, and Reagan in 1980 and 84), but even the California-free tickets of Ford/Dole and Bush/Quayle won the state.
Honestly, most of the recent Democratic strongholds during presidential elections have only been reliably Democratic since 1992 or so. Even putting aside Reagan's landslide in 1984, no state can claim to have voted for the Democrat in every election since World War II. Minnesota and New York are the closest candidates, but even they've not been 100% reliable. Only Washington, D.C. has never voted for the Republican since WWII, but they didn't vote in presidential elections until 1964. Hawaii has voted for the Democrat in every election since 1960, excluding Reagan in 1984.
The same can said about the Republicans only if you include Goldwater's loss in 1964. Excluding that year, North Dakota, South Dakota, Nebraska, and Kansas have voted for the Republican every time. Indiana has in every instance except 2008, and Virginia in every instance except 1948 and 2008.