The Hill 
Jan 15, 2013
Gun control is turning into an early litmus test for potential 2016 Democratic presidential candidates, with a number of hopefuls rushing to establish their bona fides on the issue.
Vice President Biden is leading the charge on national legislation, and New York Gov. Andrew Cuomo (D) rolled out strict gun-control proposals last week.
Not to be outdone, Maryland Gov. Martin O’Malley (D) introduced his own plan on Monday.
Colorado Gov. John Hickenlooper (D) and Sen. Mark Warner (D-Va.), two purple-state politicians sometimes mentioned as potential candidates, came out with surprisingly pro-gun-control proposals following the December shootings in Newtown, Conn.