Mitch is an abolute dirtbag--he's the most dangerous politician in the land, not Trump--his breakaway from Trump means one thing--he sees the end for Trump, and doesn't want to go down with him. Never mind that he's spent the last four years enabling the clown. Never attribute to heroism what you can easily explain with selfishness. Mitch is the same asshole who, with a straight face, hurried through Trump's Supreme Court nominees after holding up Obama's for almost a year. He's a hypocrite of the highest order, but that's the GOP for you, they excel at being hypocrites and it's a proven working strategy for them.
Bottom line, he (and Pence) are only breaking from Trump because they see this not working out for Trump, or for them if they stand behind him. If they did, they'd be all in. They are worthless scum, proven by many years of so-called service.