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John Rosenthal is a developer who owns a parking garage next to Fenway Park. You might recognize the garage better from the Mass Pike — it sports one of the country's largest billboards, where American gun deaths are being tabulated since the Sandy Hook Elementary shootings.

Nearly one year to the day, the groundswell for gun reform has amounted to little change. Rosenthal — founder and chair of Stop Handgun Violence — talked with Jim Braude and Margery Eagan about realistic ways for Congress to make progress.

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