Don't see that this has been posted yet. Another informative article by Rep. Lamar Smith, well worth the read. He has written several excellent articles recently about illegal imigration:

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National Review
February 26, 2009, 4:00 a.m.
Letters

Immigration Policy, Voting, and the Economy
Rep. Lamar Smith responds to Richard Nadler.
To the Editor

In “A Costly Debateâ€