10th Amendment: "The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."
"Congress is not empowered to tax for those purposes which are within the exclusive province of the States."Justice John Marshall, Gibbons v. Ogden, 1824.
”From the accepted doctrine that the United States is a government of delegated powers, it follows that those not expressly granted, or reasonably to be implied from such as are conferred, are reserved to the states, or to the people. To forestall any suggestion to the contrary, the Tenth Amendment was adopted. The same proposition, otherwise stated, is that powers not granted are prohibited [emphasis added].” —United States v. Butler, 1936.
"Article I, Section 8, Clause 7: To establish Post Offices and post Roads;"
So the key question to ask regarding political parties and federal domestic policy is how many political parties does it take to run the mail service?
I say none, no political parties needed.
When the states finally wake up and repeal the 16th and ill-conceived 17th Amendments, the repeal amendment needs a provision to prohibit political party support of federal elected officials.
The individual states will retain the power to destroy themselves with political parties. An imploded state can become a US territory again until somebody figures out what to do with it. /semi-sarc
No political parties is an idea that needs to be discussed.