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- Dianne Feinstein, 89, now sidelined by shingles, is facing calls from Democrats to resign.
- If she steps down, Gov. Gavin Newsom would name a replacement to serve the remainder of her term.
- Three Democrats have already announced they are running for her seat in 2024.
Dianne Feinstein has been sidelined by a shingles diagnosis, and the 89-year-old faces concerns about her mental acuity and calls from within her party to resign after 31 years of service in the Senate.