What makes a U.S. Senator vote against gun reform supported by an overwhelming majority of Americans? We found a few sales receipts that might help explain it. The 45 senators who voted to block expanded background checks have received a combined total of $8,165,490 in lifetime contributions and independent expenditures from the NRA, Gun Owners of America, and the National Association of Gun Rights. Even though 91% of Americans -- and 74% of NRA members -- support background checks for all gun sales, these senators voted against effective measures that would save lives.