The failure of the Manchin-Toomey legislation yesterday to expand background checks for gun purchases has been blamed on a variety of factors. But one key detail is the fact that the gun lobby — consisting of the National Rifle Association, Gun Owners of America, and other groups funded by the gun industry — was a major fundraiser for Senators that opposed the reform bill.

The Center for Responsive Politics laid out donors to senators who both supported and opposed Manchin-Toomey, and found that lawmakers who opposed it received nearly eight times as much funding from the gun lobby. Meanwhile, it found that only $5,000 came from pro-reform groups (to the “yes” side):

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