Manchin is not a centrist, he's a conservative.

I don't even think he could be classified as center right.

Environmental policy, nope. Threatened an environmental bill and only voted on it because of inflation reduction.

LGBT rights, nope. Voted against the equality act.

Abortions rights, nope. He's literally the reason roe wasn't codified in may.

His conservative stances far outweigh any liberal ones. And I mean he's even threatened multiple times to switch parties.

But I do see Biden being center left, he's very socially liberal. Borderline progressive in some areas. People on the left do classify him as more conservative than he actually is.