It seems to me that the antigunners have gotten much more vocal in the months since the Zimmerman/Martin incident. I don't really think their numbers have increased that much, though. Sure, a few fence-sitters fell off onto their side of the pasture, but I'm sure a few fell off onto our side, too.
I'm a lawyer, but I'm not your lawyer. If you need some honest-to-goodness legal advice, go buy some.