The stats I have seen show illegals to be a clear drain on the economy. Also, southern california is a complete mess with mexican gangs, a very large % of whom are illegal immigrants.
Its not just about the $, illegals also change the culture and makeup of America negatively as many of them do not have the best values, great work ethic, respect for our laws, traditions and education.
Let the immigrants who want to be productive in on a fast-track to citizenship. Welcome them! Force the others to leave. We must protect our boarders, it is the law and needs to be enforced. A country without boarders will spiral downward.
Its not just the democrats who support illegal immigration (or choose to do nothing about it), its greedy business owners who pay less for labor.