Why knows why? ... Maybe they don't think he deserves to be where he is ... maybe they think he's a poseur ... maybe they are jealous of his good looks?
To use a Joe Klein analogy, if McCain, Rudy, and Fred are the ornery kids in the back of the classroom, Mitt Romney is the kid in the front row who raises his hand to answer every question.
Regardless of why they dislike him, it's clear they do, in fact, dislike him. This is something that I have observed this past year, but it is more than obvious if you are watching the debate ...
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