I am disappointed that "The Constitution" doesn't get mentioned by more people. Clearly, the USA has a terrible Constitution and it needs a new one. What might have seemed sensible 1787 certainly does not make sense in 2017. And many of the items that people do list are merely symptoms of the sickness of the Constitution. Among its many flaws, perhaps the most obvious is the "Rotten Borough" problem of the less populated states. Britain faced this problem in the early 1800s and resolved it with the reforms of 1832:

https://en.wikipedia.org/wiki/Rotten_and_pocket_boroughs

I have a personal list of things I'd like to see in a new Constitution, but what I personally want is not very important. What is important is that the citizens of the USA realize what is the root cause of the many ills they complain of: the Constitution.