While passing gun control in an election year had proven to be a BIG LOSER for the anti-gun politicos, ranting about it is not. They get to turn to their anti-gun base and say "keep supporting us, we're still trying", and our guys get to turn to us and say "see, we stopped them, keep us here!"
I think its more smoke and mirrors. Or more precisely, a great tempest, full of sound and fury, signifying, nothing...
With all the problems the other side has been having over other things they support, I think them actually getting more gun control passed would be worse for them, overall. Might just be the straw that breaks the camel's back for them. Some of them, at least have to realize the possibility exists.
That won't stop the zealots, of course, nothing short of their retirement from power ever does...