A Rochester, NY man holds a sign as U.S. Park Police walk through the Occupy DC encampment in McPherson Square on Jan. 30, 2012 in Washington, DC. Protesters affiliated with the Occupy Wall Street movement have been camped at two sites in the city for months. Today, U.S. Park Police are set to begin enforcing a ban on overnight camping in the park. (Brendan Hoffman/Getty Images)