| http://www.w3.org/ns/prov#value | - After a private discussion with officials such as U.S. Sen. Bob Casey, D-Pa. -- who changed his position after the shooting to support an assault weapons ban -- Pennsylvania Attorney General Kathleen Kane and Philadelphia Mayor Michael Nutter, Mr. Biden said proposals including requiring background checks of all gun purchasers and limiting high-capacity magazines would allow the nation to answer t
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