From (the recently purged from Cato?) Will Wilkinson:
The average Tea Partier is, like the average voter, a collection of reflexes, prejudices, resentments, and demands that add up to no coherent philosophy at all.
Wilkinson is right to note that this incoherence is not unique to the Tea Party... it is a philosophical incoherence that knows no ideological boundaries. His whole post is short and well worth reading. One potential implication of this line of thinking is that people sacrifice philosophical purity in favor of economic or ethical interests.