Yep, just a grass roots movement:
  The Tea Party has been billed as an organic grassroots operation, but a newly uncovered document obtained by Politico suggests the movement has been successfully co-opted as a Republican fundraising ploy.

GOP political consultant Joe Wierzbicki floated the proposal a year ago today to create the Tea Party Express, a nationwide bus tour to "give a boost to our PAC and position us as a growing force/leading force as the 2010 elections come into focus." His idea eventually became one of the best known brands in the Tea Party movement.