I'm not joking. If anyone wants to start a movement, I'll gladly join. And a few of my friends will too.
We could call ourselves "The United States" and leave the old part with the "America" moniker since rednecks don't ever call it anything else. We could adopt the Constitution, with some minor adjustments, and set out to live in the country our forefathers intended to make. All the intellectual capital would be in the new nation and the old "America" would descend into the deepest depths of economic recession and mass chaos. Before long, they'd be coming back begging to reunite, at which point we would accept on the conditions that they abide by the Constitution and don't cross the line between Church and state.
Of course, people would need to plan it out a little better than myself and come up with some better ideas.