Politcians are in the hands of the big businesses that payes their way to power. Big business wants cheap labour and so much of it that they can pick and choose while paying less than in a market were there is a labor shortage.
Yep. But future votes is also an issue. Demographically, potential future Mexican-Americans represent a significant power base. While this will likely benefit the Democrats more, even the Republicans have an eye on this angle since many Mexican immigrants have religious/conservative values that fit well with recent Republican platforms. Neither side wants to totally alienate this group. But yeah, business likes exploiting immigrants and they write the checks.
So as not to be a total hypocrite, I'm sorry to say that even I paid an operation with likely "undocumented" workers to do my final fall clean up this year. I was just too stretched to do it and the price was "right." However, I could live without that if push came to shove.
Charon