We frequently make political arguments based on constitutional law: This or that proposal violates the Bill of Rights and so on.
Really though, I don't particularly believe in the US Constitution. It's not holy writ handed down from on high. It's not the word of a living God. It's a political document hammered out in committee buy some politicians a couple of hundred years ago.
Like the general idea of democracy, the US Constitution is a (sometimes) useful tool for establishing order and protecting our liberties. I don't argue about First Amendment rights because they're in the holy written constitution, but because the constitution codifies my inherent right to life, liberty and the pursuit of happiness. The US Constitution is a good thing exactly to the extent that it protects our freedom.
On the other hand, this thing can be screwed and become useless. A bunch of jackasses could decide to amend the document to say that the government could, for example, lay and collect taxes on incomes, from whatever source derived. This would make the whole thing considerably less worthy of support.
Anyway, making some kind of religious totem out of a legal document doesn't reflect truth or usefulness, nor does it suit my contrary personal constitution.
In fact, the constitution was controversial at the time. We all know about the famous Federalist Papers by Alexander Hamilton, et al. There were at the same time, however, numerous ANTI-federalist papers arguing against the constitution, which was engineered to vastly increase the powers of the central government over the original Articles of Confederation.
HERE is a modern article giving a brief skeptical historical sketch of the original circumstances surrounding ratification of the US Constitution.
But there's one classic short book that lays out the case against the constitution on basic legal contract grounds. No Treason: The Constitution of No Authority was written by Lysander Spooner in 1869. He lays out a simple, clear extended legal argument against the entire overall legal authority of the constitution based on principles of basic common contract law.