He is influenced by “the old way of DC politics”, graft. AOC is doing it a newer way. I assume she is taking direct, under the table payments from tech billionaires. Manchin is holding out for a much larger, old fashion swamp payoff, probably funneled through his family,
“Mr. Smith Goes to Washington”
Joe Manchin is providing at least a faint echo of the idealism that motivated the lead character in that tale of years long gone.
AOC responds to the monied class that wants to use their wealth to fundamentally change whatever it is that America once stood for.