It is really quite simple: Business gets cheap labor, and Democrats get voters. Who would want to change that? Easterners will not wake up until the Arizona state flag is changed to depict a plastic sack hanging on a saguaro.
Actually many unemployed Americans would welcome the chance to work for the wages some of these illegal immigrants are getting.
Plus, low-wage jobs can often be stepping stones to better jobs - both for Americans and illegal immigrants.
And illegal immigration effects all workers. Because there are so many more people chasing so few jobs, the massive influx of cheap labor depresses wages generally - even for jobs which could not be filled by illegal immigrants.
I would change that to:
Business gets cheap labor, business donates big money to both political parties, and both the Dems and the Repubs want the votes so they can retain their positions of power.
Who would want to change that?
Apparently not that many voters 'cause the bums are still in D.C.