Dr. Jill Biden Signs a Pair of Her Running Shoes

Dr. Jill Biden signs a pair of her running shoes during a flight to Boston, Mass., April 24, 2013. Vice President Joe Biden and Dr. Biden attended a memorial service for Massachusetts Institute of Technology Officer Sean Collier in Cambridge, Mass. Dr. Biden also visited Copley Square in Boston, where she placed her running shoes and a bouquet of flowers at a memorial honoring victims in last week's bombings. (Official White House Photo by David Lienemann)

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• April 2013: Photo of the Day