You said the democrats used up political capital when they impeached Trump. The democrats won both houses of Congress and stole the presidency shortly thereafter.
Except then they lost the House and almost lost the Senate thereafter, and many of the local elections were a bloodbath unless the Dems in a race cheated.
If you want to see how much it matters to people, go ask average people how much they care that Clinton was impeached but not convicted. It won’t signify.