True, but there is yet another factor which hasn't been discussed. Democrats have a spirited primary for Governor and most of the downballot state offices. By contrast, the GOP only has a few competitive statewide primaries, none of them high-profile.
That means that registered Democrats will be more motivated to vote in the June 6 primary.
That would be true if this were an even remotely competitive seat. It's not. As I noted previously, Bill Simon beat Gray Davis in that district by over 18%. And in the Recall Arnold and Tom McClintock together beat Bustamante by about 55% (75%- 20.3%).
This is a very, very strong GOP seat.