This is entirely possible with Porter as well
This is actually part of why I think Porter would by far be the easiest opponent for Schiff. Unlike her, both Butler and Lee have access to a potentially potent additional source of votes in Northern California; Lee obviously has local ties there and while Butler is from LA, she most likely has the support of most of Newsom’s circle if she’s against Schiff [and also she’s now an incumbent in the whole state and isn’t seen as an LA figure].
The potential combination of Republicans, Northern California voters, whatever small number of genuine ideological progressive voters the state has, and possible inroads among minorities are what make Schiff’s propositions so uncertain in a general. Take away any of those pieces and he starts to look much stronger.