a person who strives to appear politically active while actually understanding little and contributing nothing to the cause.
Bob liked to drive his SUV to the anti-war rallies becaause he loved the chanting.
One who feels a need to be politically active, but doesn't quite know how and thereby jumps on the nearest bandwagon cause.
When Jenny arrived at University in the big city, she quickly realized the world was much bigger than (insert annonymous hick town). She figured she oughta live up to the University student cliche of protesting something, anything and found the guy behind the "down with the WTO" table very cute. She signed up immediately.