You see articles like this one raining on Sen. Joe Manchin (D-WV) and, in this particular case, claiming he has "no shame" for opposing passage of the Build Back Better monstrosity. I beg to differ.
Joe Manchin finds himself, nominally a Democrat, representing a state which votes Republican most of the time. In 2020 they cast twice as many votes for Trump as for Biden.
The first (some would say "only") law of politics is "Get Reelected." Is it any wonder Manchin acts like a Republican most of the time? He represents his state and hopes WV voters will overlook his party label come Election Day.