Joseph R. Biden

Vice President Joseph R. Biden shakes hands with Neil Heslin (center), whose son Jesse Lewis died at the school shootings in Newtown, Conn., after Biden spoke in New York's City Hall Blue Room on March 21, 2013. Relatives of shooting victims from Newtown, Conn., stood with New York Mayor Michael Bloomberg (right) and Biden as they spoke in favor of an assault weapons ban. (Associated Press)

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Vice President Joseph R. Biden greets Pope Francis during the Catholic pontiffs installation mass in Vatican City. (Screen shot: CNN)

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** FILE ** Vice President Joseph R. Biden gestures as he speaks March 13, 2013, at the Montgomery County Executive Office Building in Rockville, Md. (AP Photo/Charles Dharapak)

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From left, Diane Millich, a member of the Southern Ute Indian Tribe in Colorado and domestic abuse survivor, Attorney General Eric Holder, Vice President Joseph R. Biden and Sen. Susan Collins, Maine Republican, listens to President Obama speaks at the Interior Department in Washington on March 7, 2013, before signing of the Violence Against Women Act. (Associated Press)