Sen. Dianne Feinstein, a prominent veteran of California politics for over half a century, has died at age 90.

A Democrat and strong activist liberal from San Francisco, six terms as a U.S. Senator and the state’s senior senator since ’93, three terms as mayor of San Francisco from 1978 (she succeeded Mayor George Moscone after his 1978 murder) to 1988, etc.

More recently (and certainly within the last five or so years) Feinstein became not only a symbol of age diminishment but of the same kind of obstinate refusal to accept reality that we’ve recently seen from Sen. Mitch McConnell and which we may see down the road from President Joe Biden.

Big-time politicians never, ever resign over aging issues. They either get voted out or die — there’s no third way.

Who will Gov. Gavin Newsom appoint to serve out Feinstein’s term? Will he choose a caretaker or one of the three announced candidates for Feinstein’s seat — Adam Schiff, Congressperson Barbara Lee, and Rep. Katie Porter?

If Newsom picks one of these three, he’ll be giving that person a huge leg-up in the ’24 primary.