I think you are probabely right. However, currently the police are not arresting immigrants, nor do they want to get in the business of arresting immigrants. I think this ruling would give the INS some ability to force the locals to cooperate.
If you are from Florida, maybe you can tell me if the two republicans mentioned are of Cuban decent and if they are why would they be throwing in with mainly a Mexican desire.
Both are of Cuban descent, and I'd make a safe guess that they are aligning themselves with other Hispanic groups (not only Mexicans) for one simple reason: votes. South Florida has had a tremendous influx of illegal Latin Americans, to name just one group.