The 77th Assembly District falls entirely within the boundaries of San Diego County. Brian Maienschein (D) is the incumbent in this race. Maienschein was a Republican up until after the 2018 election where he switched parties after narrowly winning re-election.
This district shows the following party registration for the three largest political groups (the source is http://www.l2political.com):
Here are the result for the June 2018 race:
Sunday Gover (D)- 43.9%
Brian Maienschein (R)- 56.1%
We saw a total of 112,823 ballots cast in the primary. Maienschein narrowly won in November by a margin of 50.2% to 49.8%. This might play a small role in why Maienschein decided to change parties.
This is similar to the Assembly seat where Chad Mayes changed parties after winning; however, Maienschein decided to become a Dem instead of an NPP. Here are the March 2020 results:
Brian Maienschein (D)- 57.5%
June Yang Cutter (R)- 42.5%
151,382 ballots were cast in this race. Ironically, the percentage for March was the exact same as AD 76.
Cutter is another strong candidate but I think Mainschein will win over Dems and some moderate Republicans. I predict that Brian Maienschein will win an extremely close race in November.