It's not what he's done to Latinos, it's what he hasn't done. His Latino outreach has been weak. It's very apparent in places with high Latino populations. On the other hand, Latinos view Clinton as someone who's been reaching out to them and fighting for them for decades. (And McCain has that tough-old-guy-war-hero attraction, he's from a border state with high Latino population, and he's not as scary about immigration as his fellow Republicans.)