Read Lawrence Lessig's blog post "Focus at a time of tragedy" that highlights the "illegitimate concentration of money" by "1/20th of the 1%" that determines, not only gun control, but many of the "insane" policy decisions members of congress make.  Through Rootstrikers, he asks us to become more involved in issues.  "We can't afford insane policy anymore. We can't afford it with taxes, with climate change, with health care, with the debt, or with Wall Street. And we can't afford it with guns. 

http://www.rootstrikers.org/focus_at_a_time_of_tragedy