AP Photo - Vice President Joe 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, Thursday, 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.

AP Photo - Chris and Lynn McDonnell, left, whose daughter Grace was killed in Newtown, Conn., and Neil Heslin, third left, whose son Jesse Lewis also died at the school shootings in Newtown, listen as Vice President Biden speaks in New York's City Hall Blue Room, Thursday, March 21, 2013. Relatives of shooting victims from Newtown, Conn., stood with New York Mayor Michael Bloomberg, foreground right, and Biden as they spoke in favor of an assault weapons ban.

AP Photo - Vice President Joe Biden, left, Chris McDonnell, second from left, and others, listen as McDonnell's wife Lynn McDonnell, whose daughter Grace was killed in Newtown, Conn., speaks in New York's City Hall Blue Room, Thursday, March 21, 2013. Relatives of shooting victims from Newtown, Conn., stood with New York Mayor Michael Bloomberg, second from right, and Biden as they spoke in favor of an assault weapons ban.

AP Photo - Vice President Joe Biden, center, meets with Chris and Lynn McDonnell, left, whose daughter Grace was killed in Newtown, Conn., and Neil Heslin, right, whose son Jesse Lewis also died at the school shootings in Newtown, after Biden spoke in New York's City Hall Blue Room, Thursday, March 21, 2013. Relatives of shooting victims from Newtown, Conn., stood with New York Mayor Michael Bloomberg and Biden as they spoke in favor of an assault weapons ban.

AP Photo - Vice President Joe Biden, left, accompanied by New York Mayor Michael Bloomberg, speaks in New York's City Hall Blue Room, Thursday, March 21, 2013. Relatives of shooting victims from Newtown, Conn., stood with Bloomberg and Biden as they spoke in favor of an assault weapons ban.

AP Photo - Vice President Joe Biden, center, meets with Chris and Lynn McDonnell, left, whose daughter Grace was killed in Newtown, Conn., and Neil Heslin, right, whose son Jesse Lewis also died at the school shootings in Newtown, after Biden spoke in New York's City Hall Blue Room, Thursday, March 21, 2013. Relatives of shooting victims from Newtown, Conn., stood with New York Mayor Michael Bloomberg and Biden as they spoke in favor of an assault weapons ban.