The entire Democratic media machine, from the president's campaign to internet bloggers, held to the "President Obama respects the Second Amendment and won't take your guns away" message. He won, in large part, because enough gun owners trusted him to keep that promise and voted for him. That wouldn't have been necessary, and wouldn't have even worked if there was a strong gun-control movement in the U.S.
In fact, since 2007 voters in at least 36 states have REDUCED state gun control laws. If an "assault weapon" ban passes those same pro-gun voters will eviscerate the national Democratic Party.
I think President Obama understands that.