The rally has three goals: to encourage atheists and secularists to come "out of the closet," to show that atheists do not fit any particular model - they are all races, ages, and persuasions - and to demand "legislative equality," that is, the actual ability to run for office and be elected.
MORE: http://peoplesworld.org/largest-secular-rally-in-world-history-planned-for-d-c
