Suppose someone rises to power with little regard for legislative oversight and activates the sleeping military at home. It might start with a real (or faked) terror event coordinated across several major cities. It wouldn't take much at all, 5-10 cities, and suddenly: 1. Internet & cell communications are shut down 2. a national state of emergency is declared 3. A curfew is issued 4. Dissidents are squashed via a military police force with little recourse themselves. 5. Everyone is required to have location-aware implants "for safety."
With a little fear, a government could take full, permanent control of their citizens via aggressive laws and more aggressive enforcers. Would it even take two weeks?