Calling Folsom "conservative" is misleading; it was Biden+7. Sure it's historically Republican but that's neither here nor there. Roseville and Rocklin are also fast trending D, with Roseville only Trump+1 and Rocklin Trump+5. This is a very trends-are-real type of district that would have been unwinnable for the Democrats 10 years ago and will be unwinnable for the Republicans 10 years from now; Bera just has to hold on for a cycle.
A few more things to note about Folsom. For one thing, it’s already in Bera’s district. And second, it’s rapidly expanding south of Highway 50. There’s a lot of Bay Area transplants as well as Asian-Americans thanks to Intel and its generally good reputation. It’s one of those high-education suburbs that Dems have done well in since Trump was elected and even before then tbh.
In 2014, Brown narrowly beat Kashkari in Folsom; not sure about 2018 or the recall, but Folsom has been getting bluer over the last decade.
Bera should definitely be nervous, but I’ll wait until the final map comes out to make any real prognosis.
All this being said, the map that puts Humboldt and Shasta Counties together is laughably stupid.