Michael Dukakis actually won Los Angeles County in 1988 election...51.89%
https://en.wikipedia.org/wiki/1988_United_States_presidential_election_in_California
However, George H.W. Bush did win in CA in 1988...He is the last GOP nominee to win CA...
Los Angeles County is a liberal area, not a conservative area...Many conservatives moved out of LA County...Liberals replaced them...