Volunteers place grave markers on the National Mall Thursday to remember victims of gun violence. Clergy from Newtown, Conn., and elsewhere will begin a 24-hour vigil to urge Congress into passing tougher gun laws. Photo by Mark Wilson/Getty Images.

Lawmakers in Colorado have grappled in recent weeks with how to respond to the mass shootings in Aurora and Newtown, Conn. Friday the state senate begins voting on those bills, as well as additional measures that would prevent people who…

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