Manchin - He wants to run for President. Every zig, every zag has to be interpreted in that light. He sees himself as the next Bill Clinton. Slick was sold to us as the middle answer between the left & right political extremes. Manchin is building a case for that type of sale. He can argue he's even a better choice then Slick, Manchin hasn't the zipper problem or the harpy wife. (As far as we know!) So Manchin is going to do the 1992 triangulation political ploy. I think he will fail because this is not 1992. The political demographics are very different now.
His fall back is be the next Byrd. A higher probability of success, but even that relies on past WV voting patterns which are no longer holding. Also he has RINO competition for “Byrd-dom” - Capito !