Lots of naivete in this thread.
This is a tricky issue, esp. for the right, because you have people who want them out, but business interests (esp. agribusiness) want them in. And not just in, but also illegal and undocumented so they can be paid accordingly, not subjected to labor laws, etc.
I know a lot of you guys subsist on frozen pizzas and Doritos, but fruit and vegetable prices would spike way up if we could somehow shut all illegals out of the country. Studies have shown that illegal immigration has a slight positive effect on the economy overall (benefit of cheap labor slightly outweighing govt costs), and given that I'm not competing with any illegal immigrants for jobs, I'm OK with the status quo.