Look at Cochran and Murkowski. They both had elections stolen for them And they've become even more detached from voter sentiment. Look at McCain. He's back to lying to the voters about his agenda. Look at that despicable Ayotte. She traitored her voting fodder before she even unpacked in DC. Look at Portman. He had the nerve to RoboCall for KSick, he traitored the pro-marriage agenda, and he never met a global trade deal he didn't love. Etc ad nauseum.
What's my point? There's not much worth saving in the US Senate.
However, all those you mention will vote for a conservative scotus pick put forward by a republican president.
If they can’t be primaried, then we have to support them. Bad medicine, I know, but Scotus is so important.