The problem I have with an issue like this is: my reps in Congress will probably vote for it. Then what do I do? Vote for anybody who challenges them in the primary (and their chances of beating an incumbent are small)? Or just suck it up, because my reps are pretty good on most other issues? Or should I just pick absolutely the single most important issue to me and vote strictly based on that? I don't like the idea of being a single issue voter, but I feel like I'm getting cornered.
We must become more politically savy than we are right now.
It isn't a matter of the voting booth anymore, but actually going out and talking face to face with your representative.
Now that might not be possible while they are in session, and the CAFTA vote will happen before they leave, but take a group of people with you who agree, and go to the office of your representative and tell them all the things that make CAFTA an attack on our sovereignty. Leave a letter with them to be put in the public record of your view. Remind them that immigration is the key issue here and now, don't let them think you don't know what CAFTA will do to the number of people entering this country.
Tell your neighbors. Have an informational coffee in your home, or meet them at a local restaurant. Just sit down and talk to them. You'd be suprised at how little most Americans know about this. They will help by writing letters to Congress, to newspapers and visiting your representatives. Your Reps will respond to pressure, we just have to start pressing them.