I believe a lot of the California congressional districts are RAT vs. RAT general election contests that the GOP can’t even try to compete in, ever since Ahnuld’s redistricting “reform” and the switch to a blanket primary system.
There were 7 D/D races and 2 D/I races in Cali last year, the recent special election for a safe rat seat was also D/D. The most competitive district to have a D/D race was Loretta Sanchez’s open seat in the bad part of Orange County, where 3 Republicans combined for a very poor percentage of the vote in the primary, dashing long held hopes of being able to make a run when she finally retired. The district went from 36% for Romney (just outside the range of the districts that mostly saw competitive races in 2014) to only 28% for Trump, I guess it’s officially an irredeemable hellhole now.
State Rep. Ling-Ling Chang, an attractive Asian Republican “lost” a close State Senate race in the area, as the rats picked up the seat.
There were no R/R races, which is good thing cause usually it would be R/RINO with the rats free to vote for the RINO, though this failed in 2014 in McClintock’s district.
As for Issa’s district, 2012 redistricting changed the 2008 POTUS numbers from 53-45 McCain to 49-48 Obama so yeah, that was a factor but not the main factor. Coastal rot, disgusting.