The reason is that it leaves Susan Collins alone in the wilderness.
Collins must realize by now that she's lost her seat. Her choice now is what kind of legacy she wants to leave behind.
Does she want to be know as a "maverick" who fought to make her party's legislation better, or does she want to go down in history as the first female Arlen Specter or John McCain, whose final act was to backstab the party that tolerated her for her entire career?
She can follow up on her Kavanaugh commitment to Democrat dirty tricks and support Amy Coney Barrett as her lasting legacy action, or she can be remembered in the end as a bitter disappointment who tried desperately to hold onto power by tossing her party under the bus when they needed her for a history-changing vote.
-PJ
“Collins must realize by now that she’s lost her seat”
They haven’t given up on her holding her seat. Recent polls show the race neck and neck.
Fingers crossed.