"What say, Rig? Would you do that? Is immigration THE make or break issue for you?"

             Little Hawk - The issue for me is the survival of the planet (at least the survival of life on the planet). I think the single biggest threat to the planet is unchecked human population growth.
             Probably the thing that amazes me the most are people who will get worked into a lather over deforestation, global warming, ozone depletion, and paved over farm land, but they can't make the connection of those things to increasing population. It seems to be like you say, if nobody puts a plank in their political platform about popultion growth, it doesn't exist for them.
             Worse than that, are those people who will openly complain about population growth, but can't seem to connect that eventuality to human migration. They continue to want to see it as a civil rights issue. It's a form of tunnel vision. They can look at Easter Island, and see what unchecked humanity did there, and then turn their gaze on Mexico City and fail to make the connection.
             Obviously, if you are going to do something about population growth, you would want to start with those places where the birth rates are the highest. If some place on the globe is spewing out more people than it can support, and the excess people are simply allowed to go somewhere else, it does nothing to control population growth where the person comes from, and increases the population where that person ends up.
             That's a long way around the question, but I would say yes, because population growth is the planets largest problem, I would support almost any candidate who would do something about it.
             Applying that litmus test to Sarah Palin, I'm not sure where she stands on immigration, but if she would come out strong against immigration, while preventing family planning programs in poorer nations, not much would be accomplished.