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McCain thinks we need more justices like Scalia and Alito. Do you really want that to happen? Will you be able to live with the consequences (and with yourself) if that happens?
That's not going to happen. Clinton's supporters are liberals and moderates and they're not about to morph into neocons out of disappointment or spite.
They'll do what people normally do, which is call it politics and move on to another candidate whose policies most closely approximate their ideals. For Clintonites, that's not McCain.
Hillary will prove herself to be a loyal Democrat, and not really a closet neocon, by graciously conceding the nomination once it becomes clear that she cannot win.
She will do that, won't she?