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How Joe Manchin and a broken senate squandered U.S. will for gun reform after Sandy Hook 

03:20

Rachel Maddow looks back on how Joe Manchin, with Pat Toomey, in the wake of the Sandy Hook gun massacre, supplanted President Obama's call for universal background checks for gun purchases with their own weakened version which they then failed to pass, leaving the broken U.S. Senate with nothing to show for the gun slaughter of young children and teachers at school.