On the other hand, it was widely publicized that a poll (Zogby Int'l?) taken in Mexico earlier this year indicated that 58% believe the southwestern US rightfully belongs to Mexico.
Unless one believes only those who respect the territorial integrity of the US are immigrating northward I suspect this indicates we have a problem larger than some would have us believe.
I think it's safe to say that those who choose to come to America illegally don't have a high regard for U.S. sovereignty.
On the other hand, those who come here legally tend to be some of the strongest supporters of measures to secure our borders. Maybe they're "racists".