Hard to predict exactly what they will do, but obey the constitution is not one of the likely choices.
You have to go by the evidence, and the O-bummah admin has done nothing lawful during its tenure.
That said, one would hope that the more outrageous Obama becomes, the more motivated the population will become to push back. I believe that organizing a militia gathering and then surrounding them and confiscating their lawful weapons would be akin to closing off a Warsaw ghetto and criminalizing its residents.
That would be an outrage that would quickly mobilize the rest of the nation.
-PJ