Interesting TheAtlantic article with details re polls that ignore Spanish-speaking voters.
http://www.theatlantic.com/...
"Not polling in Spanish in national polls could underestimate the Obama vote by one-half to one percentage point. This is a small number in an absolute sense, but very significant in a tight election."
Project New America - Grove Insight polls are a good example of concise polling that included cell phones and Spanish-speaker-only.
http://www.projectnewamerica.com/... and scroll down for all their poll details.