After recently predicting a Scott Brown loss, I may have to eat a tiny sliver of humble pie if Brown ultimately upsets Martha Coakley, as a recent poll predicts [Mass. Senate Poll Shows Shift Toward GOP Candidate, By Glen Johnson, Associated Press, July 15, 2010].   But as James Fulford just pointed out, Joe Guzzardi and myself were correct in noting that immigration is a winning issue for Scott Brown in this election, even if he isn't actively campaigning on it.