I don't think many people who have actually read the U.S. Constitution want it changed. It's a concise, carefully-worded and well-thought-out document that gives the Federal Government the tools it needs to operate, without getting bogged down in details. Even in Liberal circles, the most I ever hear are calls for changes in term limits or the electoral process, which is more like tweaking the Constitution rather than changing it.

State Constitutions serve a different purpose, though, and are right to be more detailed, and also more flexible. As a general rule in government, the closer you are to individual people, the more precise you should be in law and policy. Something as distant as the US Constitution should be very broad and general, do you learn more with procedure than anything; something as close as a city ordinance is where you should find things like how to keep your yard, etc.