Advocates for gun rights have spent nearly 25 times more in Washington than gun control supporters since 2009, according to the Center for Responsive Politics. Led by the National Rifle Association, one of the most well known and powerful lobbying forces in politics, gun rights organizations spent $17.4 million on lobbying Congress and the Department of the Interior — about $5 million per year. Besides formal lobbying, these groups have flooded elections with cash; the NRA alone has donated about $2.8 million to state and federal politicians in the past 3 years and has already spent $60,000 on ads attacking President Obama during this election cycle. Republican politicians are their top beneficiaries, including House Speaker John Boehner (R-OH), Sen. John Thune (R-SD), and Sen. Dean Heller (R-NV).
Update:
In the past year alone, gun rights groups spent 17 times as much as gun control advocates.