What's wrong is that we have two different electorates that are increasingly different from each other and the way our system is set up means that we have wild, embarrassing swings from pathetic ~40% turnout rates. The end result is a wildly unstable and schizophrenic government that doesn't represent the broader population, exacerbated by other issues such as voting rights restrictions, gerrymandering, the nature of the Senate, etc.
Yes this is correct.
Obviously (BREAKING NEWS alert) the problem is that both a President elected two years ago and a Congress elected now by wildly different electorates can both claim a mandate and it's not clear what the f!ck is supposed to happen.