I see us getting 50 seats.
I also see Manchin (assuming he wants to run again in 2024) voting to keep McConnell as Majority Leader.
Manchin isn't running again, and even if he is, he voted to remove Trump from office during impeachment, so there's no way he would switch to caucusing with the GOP.
Mitt Romney also voted to remove Trump from office, if I remember correctly...
Manchin is endorsing Biden, and appears to be opposing ACB. He's not the most reliable Democrat but he's still a Democrat. This is as crazy as people who say Murkowski will start caucusing with Ds or Romney will become a swing-senator in a Biden administration