Nate Silver has an "interesting post":http://fivethirtyeight.blogs.nytimes.com/2010/11/03/did-polls-underestimate-democrats-latino-vote/ that highlights some of
"Matt Barreto and Gary Segura":http://latinodecisions.wordpress.com/2010/11/04/how-the-national-exit-poll-badly-missed-the-latino-vote-in-2010/: bq. Examination of the method