Nothing that gulag and re education camps and selective and sanctioned assassinations couldn't solve.
Personally, all I see is a President of the future declaring martial law over malcontent states and enforcing it with the U.S Army. I.E civil war.
2020. Vote for and elect progressives and we will defer your $150,000 student loan debt payments you spent on a car, spring breaks in Florida, furniture, booze, weed, and a lousy college education you could have gotten at the public library for free.
In the US Code there is provision for the President to declare a state of insurrection to exist. This declareration triggers executive powerd far beyond martial law. It is in effect a declaration of war by the federal government on state. Lincoln invoked these powers after Ft Sumpter and were the basis for calling on the states to provide 70,000 militia to suppress the rebellion. All the other war powers such as suspension of habeus corpus, declaration of martial law in Maryland, warrentless search and arrest,all these things and much more flowed from invoking the insurrection act. I can imagine a future BHO or Hillary invoking these powers nationally to put down mass resistance to statutes that essentially abridge the Bill of Rights. Also the President could call on member states of the UN and NATO; of which we are members, to provide ‘volunteer’ formations to aid in suppressing the ‘insurrection’ and ‘protecting human rights’ from ‘hate groups’ such as the NRA.
Cultural cleansing is not easily undone.