She's from a purple state that another Dem could win, and she has several incidents now (the curtsy, this recent speech, etc) that are easy to make into a commercial in a Dem primary. Note that Mark Kelly from the same state is not the problem for us that she is, neither is Warnock and Ossoff from an equally purple state in GA.

Manchin is from a deep red state and there is little we can do to him.

The old school Dems would dig up dirt on both of them and pull their strings ... wish we had some of that hardball mentality in this current party. Sinema and Manchin seem to have no fear of disrespecting a Dem President and derailing his agenda.