What Boston celebrates as Patriots' Day has been morphed by many into a militia rally incorporating guns, Waco and Oklahoma City. John Avlon on a fringe holiday growing larger each year.
Tea Party activist JoAnn Elar Betts, from Smithtown, New York, demonstrates during a tax day rally outside the Korean War Memorial in Hauppauge, New York April 15, 2010. (Shannon Stapleton / Reuters)
