The 78th Assembly District falls entirely within the boundaries of San Diego County. Todd Gloria (D) is the incumbent in this race. Gloria has held the seat since 2016.
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:
Todd Gloria (D)- 71.2%
Maggie Campbell (R)- 28.8%
We saw a total of 111,988 ballots cast in the primary. The November election was also no contest for Gloria with the result being, 71.1% to 28.9%
Gloria is not seeking re-election and no Republicans are seeking the seat. Three Democrats sought the seat in the primary. Here are the March 2020 results:
Sarah Davis (D)- 27.7%
Micah Perlin (D)- 16.7%
Chris Ward (D)- 55.6%
124,276 ballots were cast in this race. The ballots cast are irrelevant by party due to the Republicans getting locked out of November.
Ward has the advantage of Name ID and resources I predict that Chris Ward will win in November.