If Feinstein were to resign, Governor Gavin Newsom would appoint her successor. There is only one person to consider for the appointment, and that person is Representative Barbara Lee.
The appointment would give Lee the advantage of incumbency, but it would also fulfill Newsom's comment in 2021 that he would replace Senator Feinstein with a Black woman if she were to retire before the end of her term. Though his comment suggests identity politics over merit, Barbara Lee is as historic a figure in Congress as anyone, and way more so than most. She is highly qualified to replace the aged and forgetful Senator who is currently not present to fulfill her duties.