Taxes, Tea, and the Gospel

I am sure you have seen or heard about (or maybe even attended) these "tea parties" to protest some of Obama's tax policies. Now, I am not going to say that people should never go to protests like these. I will tell you what bothers me a bit about protests like these.

Typically, these are filled with "right-wing" or "Evangelical" or "fundamental" Christians. How many of these Christians get upset enough to protest when they see the Word of God being misused or when they see sin in their churches. Why is it that we get all up in arms over goings on in a kingdom that even Christ Himself said wasn't His (John 18:36)?

Seems like it would be a much wiser thing to save our energy and passion for things concerning the Kingdom of God than worrying about taxes. Even if taxes go up, did not Jesus promise to provide for us if we seek His kingdom first (Matthew 6:33)?