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NBC News' Kelly O'Donnell discusses the expected Senate vote to extend background checks, as proposed by Sen. Joe Manchin, D-W. Va., and Pat Toomey, R-Pa. MSNBC's Craig Melvin and O'Donnell also discuss a new NRA ad. O'Donnell also mentions that the office of Sen. Richard Shelby of Alabama was also being searched due to a suspicious envelope.Apr.17.2013