Some Republicans have been suggesting this might be the case, but here it is from libertarian Lew Rockwell:
[R]ecent Tea Party people who allegedly denounced a Parkinson’s patient or spat at gay and black congressmen might well have been agents. Offensive signs might be Made in DC too. Next might come calls for violence by alleged Tea Party types, and perhaps acts, which can be used to suppress dissent. Peaceful resistance is not only right, it is all that works, unless you are with the state. If anyone urges the use of violence, the state’s characteristic action, he is probably an agent.
And they might also have a tiny alien pilot in their heads. The galaxy is on Orion's belt! Look for a small marble or a jewel!