Good read @benfarmer.
Lot's of truth here...

Yes absolutely they have been infiltrated.
How else can you explain:

• Newt Gingrich being declared the leader of the tea party?
• Bill Weld a LP VP candidate?
  ...?

But you don't have to blame infiltration on a lot of the divide ourselves nonsense coming from libertarians, voluntaryists, anachists...

• If you don't believe _______fill in the blank______,
  you're not a true _______fill in the blank______.
  • How about instead we focus on our areas of agreement (UNITY)?