Manchin is against Democrats pushing things on a purely partisan basis in the Senate and he's more or less forcing both sides to negotiate in good faith even though both of them don't really want to.
Whether or you can get an infrastructure bill signed by Biden out of those negotiations is another matter.
Democrats will lose both houses of Congress because Americans have shown, time and time again, that every time someone goes for a pure party line thinking voters are going to punish them, or do you forget Democrats passed Obamacare on a pure party line vote and voters gave them hell for it?Because unlike you I simply see history repeating itself for the democrats with nothing being learned. What does this accomplish in the end? let's say you are right we coddle and love Manchin with all our hearts. Without the voting rights bill democrats will lose both house of congress and possibly 2024 so all this progress will be for naught. There's no redo here these laws solidify the GOP minority rule for decades to come.
Biden won the primaries against the wishes of the left wing of the Democratic party and then proceeded to win the election against Trump. Trump who embraced the most idiotic redneck thinking during COVID on masks, social distancing and lockdowns.
Democrats lost over a dozen seats in the House while gaining 3 seats in the Senate. The House which has been marked by more and more political extremism while the Senate has not. By all means having people like AOC and many others crying over "defund the police" worked brilliantly!