In 2012 Manchin's candidacy was endorsed by the National Rifle Association (NRA), which gave him an "A" rating. Following the Sandy Hook shooting, Manchin partnered with Republican senator Pat Toomey to introduce a bill that would have strengthened background checks on gun sales. The Manchin-Toomey bill was defeated on April 17, 2013, by a vote of 54–46; 60 votes would have been required to pass it. Despite the fact that the bill did not pass, the NRA targeted Manchin in an attack ad.