So long as Feinstein continues to choose to run, there is little that anyone can do. At least those constituents can see that the republican party is a non-starter as they actively make everything worse for everyone.
Afaik, there is not a single R that would pull a Manchin or Simena and vote against party lines (for more progress at least, many of them will vote against out of spite or to push to make things even worse).