It wasn't for the lack of trying.
Do tell. What bill did the Obama administration send to the hill that would have restricted the 2nd? In what speech did Obama call for restricting the 2nd? What EO did Obama sign that restricted legal gun buying or ownership? During Obama's first 2 years, democrats had control of the house, senate and White House, What gun control bill was passed?
Seems their trying was nonexistent. Except in the endless rhetoric coming out of the NRA and parroted by the right.
Funny how facts squash rhetoric.