Contact these groups and maintain a regular correspondence. The local office of your senator or representative. You are a constituent, and the staffers at your legislator's home office are more than eager to help you stay informed. Prepare a form letter which can be used by students who agree with AMSA's position. You should provide stamps and envelopes.
Food never hurts.
Just be sure that people don't grab lunch and run. Some applications let you set up a database where a student can type in his or her name, address and legislator, and the computer will spit out a nice looking letter to be signed by the student. Give participants paper and pen to transcribe the letter. In both this method and the hi-tech method, have the participants address, stamp and seal the envelopes. Collect all the letters and mail them off that day.