Secular Coalition for America

The Secular Coalition for American is an advocacy organization made up of many secular, atheist, humanist, etc., groups. They founded the Coalition to provide a unified voice for nontheistic people. The Coalition has offices in DC and lobbies on issues important to its constituent groups. The website has news of their lobbying efforts, blogs, and and action alert system you can sign up for to take action on issues. They hold a national lobbying day each year and train people on how to be effective with lawmakers. In 2013 the dates are April 24 through the 26. 2013.

see: www.secular.org