Throughout the corridors of many state Capitols, families are sharing emotionally gutting stories of tragedy caused by mass school shootings with the hope that revealing their trauma will convince lawmakers on either side of the political aisle to reconsider firearm policies. Yet states have for years differed widely on how to respond to the spate of mass shootings that plague the U.S. Democratic-led states have largely tightened firearm restrictions, while Republican-led ones have loosened them. That has left families being forced to wade into the legislative process, uncovering and reliving personally painful details before lawmakers with mixed results.