When does MD US Senator Ben Cardin retire and Who is likely to succeed him?

If Cardin decides to retire in 2024-
John Sarbanes-D
Jamie Raskin-D
If Cardin decides to retire in 2030-
Wes Moore-D completes his 2nd term as Governor. Runs for the US Senate before his Presidential Candidacy.
Anthony Brown-D completes his 2nd term as Attorney General. Runs for Governor in 2030 or US Senator if Wes Moore decides not to run for the US Senate.
Aruna Miller-D completes her 2nd term as Lt. Governor. Runs for Governor in 2030 or US Senator if Wes Moore decides not to run for the US Senate.
When does VT US Senator Bernie Sanders retire and Who is likely to succeed him?
If Sanders decides to retire in 2024-
David Zuckerman-P
Becca Ballint-D
If Sanders decides to retire in 2030
Jill Krowinski-D
Charity Clark-D
Who gets appointed to Diane Feinstein’s vacant CA US Senate seat?
Before 2024?
After 2024?
Ro Khanna-D becomes the first Hindu US Senator from CA.