I totally disagree at this being a good idea. It sounds like bribery and I do not condone that at all, and there is absolutely no way I am going to give a nickel to Bill Nelson no matter how he votes on this issue.
Zero money is given or promised to your representative. You send money to the NRA, JFPO, GOA, and state that you will donate to your representative's political opponent if your representative votes in favor of any federal restriction on firearms.
It's sort of like mailing them a handwritten letter that you will be watching, only it has a greater effect, because you take the time to be there, and you put your money where your mouth is.