Who Watches The Watchers? and Nullification.

One of the arguments against states' rights is that if a state (or other non-federal entity) becomes corrupt or tyrannical, the Feds would be unable to intervene.

I'm left with two thoughts:

1. With multiple, even numerous, states and locales, they would compete for citizens.
2. If the federal government has primacy, what to do if (when?) that government becomes corrupt or tyrannical? (answer here)

This is why I support nullification.

Two stories from the news on topic:
Military patrols start Friday night in downtown Columbus
NOLA cops so corrupt Feds have taken over

Nullification.
Book Review: Nullification: How to Resist Federal Tyranny in the 21st Century
Nullification: Answering the Objections by Thomas E. Woods, Jr.
Interview with a Zombie - Tom Woods
Nullification and the Thought Controllers