Not gonna happen. Oh, they may "try" to make it so, but I think the incident can also be "sold" as yet another "gun free zone" mass killing (which it was---the mall was a posted "no guns allowed" business) in response to any such attempt, and turn the argument around 180 degrees.
Do you honestly think any of the pro-gun Republicans are going to be "cowed" by any such attempt???
It really depends on the circumstances. I don't see a reporter sticking a microphone in front of any of the candidates with a lot of pro-gun supporters around.
But, if Rudy gets cornered, we might see his true side come out. He did support the AWB the first time around.