| By Betsey Stevenson and Justin Wolfers
NAPA, CA - AUGUST 27: Don Bahl (C) wears a dunce hat and a sign stating that he voted for U.S. President Barack Obama during the Tea Party Express tour kick-off on August 27, 2011 in Napa, California. Hundreds of people were in attendance as the Tea Party Express kicked off the "Reclaiming America" bus tour that will wind its way through 19 states and visit 29 cities before arriving in Tampa, Florida for a presidential debate co-sponsored by CNN on September 12. (Photo by Justin Sullivan/Getty I | Getty Images
Grassroots political movements such as the Tea Party are a mainstay of American society.