Many people who hear anti-conservative fanatics demonizing the NRA constantly will notice things like this and may change their minds.
A good deal of what voters do is separate the wheat from the chaff in political discourse.
If they hear that all conservatives are heartless, bloodthirsty monsters, then see a campaign like this and others which are supportive of good causes, they ponder...and decide that there is a cognitive dissonance.
The decision of the DNC et al to engage in blatant, in-your-face mendacity is a gift to their political opponents.
I think there's a good chance that after all is said and done, history will view this phase of the left's political strategery (sic) as being one of the most ineffective and inept in the entire span of U.S. precedent.