The American Humanist Association sent letters to all 435 newly elected Representatives asking them not to join the Congressional Prayer Caucus when they begin office.
MORE: http://www.americanhumanist.org/HNN/details/2012-11-aha-to-newly-elected-congress-dont-join-prayer-caucu
See also...
Atheists Claim Congressional Prayer Caucus Treats Them Like 'Second Hand Citizens'
http://global.christianpost.com/news/atheists-claim-congressional-prayer-caucus-treats-them-like-second-hand-citizens-84719/