Vice President Joe Biden speaks at a memorial service for slain Massachusetts Institute of Technology campus officer, Sean Collier, at MIT in Cambridge, Mass. Wednesday, April 24, 2013. (AP Photo/Elise Amendola)

Associated Press
Vice President Joe Biden speaks at a memorial service for slain Massachusetts Institute of Technology campus officer, Sean Collier, at MIT in Cambridge, Mass. Wednesday, April 24, 2013. (AP Photo/Elise Amendola)
Vice President Joe Biden speaks at a memorial service for slain Massachusetts Institute of Technology campus officer, Sean Collier, at MIT in Cambridge, Mass. Wednesday, April 24, 2013. (AP Photo/Elise Amendola)
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