Call, write e-mails, send a telegraph, however you prefer, just get in touch and let them know how you feel.
There are 12 undecided senators leaning against the Amnesty bill:
Bond (R-Mo.), Bingaman (D-N.M.), Burr (R-N.C.), Boxer (D-Calif.), Cochran (R-Miss.), Conrad (D-N.D.), Ensign (R-Nev.), Levin (D-Mich.), Gregg (R-N.H.), Nelson (D-Neb.), Hatch (R-Utah), Webb (D-Va.).
Be sure and contact these.