Couple of problems with this poll. The district is only 31% Republican, yet this poll has 40% Republicans and upped the amount of conservatives from the last poll. It's very hard to trust SurveyUSA, they've been very messy this year.
Well, this is a midterm election in a Hispanic-majority district. I wouldn't be all that surprised if Republicans wildly out-perform their numbers here.
Actually California is one of the few states where there is no enthusiasm gap, perhaps due to the marijuana legalization proposition.