You should look at what gerrymandering has done / is doing. For example, the entire city of Nashville, TN, has been utterly and
obviously gerrymandered out of existence, and the city has no representation in the House. (They used to be TN's 5th.)
This of course does not apply to Presidential elections. The President has multiple times indicated disdain for elections, his party has used "third term and beyond", his supporters have openly floated the idea of repealing the 22A, he's called himself "king" and "dictator".
The VRA is quite literally before SCOTUS right now.
> or, as a last resort, impeachment
"a servile congress" — they understand impeachment. If an attempted coup doesn't get impeachment, nothing will. Regardless, the GOP is going along with the president, so impeachment isn't something that's going to happen.