So, RINO's are attacking Simon for opposing gun control, even as the Dims are counseling their candidates that gun-control has replaced social security as the "3rd rail" of American politics.
(Whatever a '3rd rail' is! Tracks around Texas only seem to have 2!)
Subway systems in NYC and elsewhere have trains running on two rails, with a third rail off to the side which carries the high-voltage power for the train. Touch it, and you get several hundred volts passing through you. Every once in a while in NY, some homeless guy gets killed by urinating on the third rail