The Center for Immigration Studies had published lengthy, documented reports on this months ago!
CIS also published a thick, detailed booklet comparing pairs of otherwise-similar cities - with half being high-immigration cities that invariably came out as far worse off.
When Bush was campaigning, the media refused to consider the immigrant situation in Texas when it came to education statistics and poverty levels. It obviously makes a huge impact on states with high immigration levels unless you're a Republican running for office.