Manchin is a Democrat from a pretty Red State. He has to do a balancing act, if he doesn't want to get replaced. It may be that any more liberal Democrat would not win that general election. But I think he needs to pick his battles more carefully. Being in favor of things that would actually help a lot of people in his state, probably won't hurt his chances. Being in favor of Democracy (like insuring people can vote) probably wouldn't either. Those are pretty much "motherhood and apple pie" in American politics. Being concerned about debt is a losing position in his state considering most people are not going to pay a lot of taxes. Taxpayers in California and New York are going to end up paying for the infrastructure bill!