The biggest overhaul was the Apportionment Act of 1911, which destroyed proportional representation in the US House of Representatives and Electoral College. If not for that, the GOP would have to move Left to gain support from high population states.
At least as pretense, the primaries are meant to prevent the need for that. And we like to pretend a third party could be successful if the other two are sufficiently incompetent/corrupt. In practice, the lawmakers will never implement a process that gives any amount of their power to the people. There was a window of time in the 90's - 00's where we thought the future might hold something other than the cyberpunk dystopia we all see coming. Now I'm reduced to just trying to enjoy the last vestiges of the middle class before it's gone. Umm, but yeah, we should be able to vote no confidence.
Dunno if it's interesting to you, but communists in Russia often say that it can only get democratic again when the "against all" variant is returned to ballots (CPRF is usually not considered something genuine).