Hard won congressional seats will often sit out or sometimes even vote against their parties legislation but coordinate their votes inch a way that ensures that their parties legislation still passes.

Say you have 54 democrats in the senate, and a democratic president 4 democrats that had difficult races can abstain or vote against the bill while 50 democrats can vote for it, with the vice president being the tiebreaker.

As far as I know Justin Amash is well liked within his district.