This week marks five years since the Virginia Tech shootings. But advocates for gun control have made little progress. The politics behind America's gun culture.
E.J. Dionne Jr. senior fellow, The Brookings Institution, columnist, Washington Post and author of the forthcoming book, "Our Divided Political Heart: The Battle for the American Idea in an Age of Discontent."
Daniel Webster co-director, Center for Gun Policy and Research at the Johns Hopkins Bloomberg School of Public Health.
John Velleco director of federal affairs, Gun Owners of America.
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