Replace Heels Up Harris. How? She definitely won't go voluntarily. She knows it would be the end of her political career. There is no way to force her out and even if they could somehow, they'd risk alienating Black Women who are THE core of their voting base. They can't run her either. She is deeply unpopular outside the Democrat party. Black men in particular hate her.
Run Gavin Newsome. Firstly, his record is godawful. The whole country knows San Francisco (where he was formerly mayor) and LA are now literal chit holes. Crime has exploded. Americans are leaving - their population numbers only stay up due to illegal immigration. California has by far the largest number of welfare cases and is the most economically polarized of any state with very little middle class left. None of this will sell anywhere by the Left Coast and the Northeast.
Run Big Mike. Even assuming they could hide the embarrassing bulge for the whole campaign....he hates politics. He has no desire to schmooze with the lowly peasants and he has zero charisma. No matter how much the corporate media fluffs him and puts him on magazine covers claiming he's "beautiful" he's still ugly as sin and extremely arrogant and bitter - and comes across that way. Sure it might appeal to Black women but they were going to get those votes anyway. It doesn't appeal to anybody else.
Run Bend over Bernie? Aside from the fact that he's ancient, he has lost a great deal of his support after bending over for the Democrat Party Establishment twice - and being rewarded with a new house each time. Besides, the Democrat Party Establishment would never let him win.
Run RFK Jr. To the Democrat Party Establishment, that would be like electing a Republican.....I mean a real Republican and not a RINO. He would do things that are anathema to them like securing the border, staying out of foreign wars, investigating corruption that directly implicates them, not pushing Gaia Worship, dismantling much of the Deep State, etc. They cannot live with any of this.
Who does that leave? Gestapo Gretchen? She's not exactly popular and she doesn't have a good record. Its very late in the day to be entering the race for the Democrat nomination. They really don't have any options other than to hope for another Weekend at Biden's candidacy.
That's tha easiest one - Newsom appoints her to replace Feinstein.
Newsom/Whitmer or Whitmer/Newsom is the ticket.
And your idea that they are unpopular is ridiculous.