Associated Press
Joe Biden, then the chairman of the Senate Judiciary Committee, surveyed the collection of black, military-style rifles on display in the middle of the room as he denounced the sale of guns whose “only real function is to kill human beings at a ferocious pace.” The tragedy, which came less than two weeks after another mass shooting at a grocery store in Buffalo, New York, has refocused Biden's presidency on one of the greatest political challenges of his career — the long fight for gun control. Over the years, Biden has been intimately involved in the movement's most notable successes, such as the 1994 assault weapons ban, and its most troubling disappointments, including the failure to pass new legislation after the 2012 massacre at Sandy Hook Elementary School in Newtown, Connecticut.