The public opinion polling available on immigration is so confused and contradictory that I think anyone who claims to be super-confident about this is deluding himself, but
this presentation from Third Way seems fairly convincing to me. The main point to make is that only a
amnesty plan path to citizenship that includes a fine turns illegal immigrants and the businesses that hire them into taxpayers.
This article available online at:
http://www.theatlantic.com/politics/archive/2008/01/tough-fair-practical/47980/