It's funny, before I turned to the page where we see he's McCain's Vice, I was sure the telephone conversation was with Obama - heathcare, a daughter, cover of a comic book. Interesting interview above, btw, and I was surprised to see characters were modeled after actual people. As life-like as everyone looks, I sometimes thought Mitchell in particular didn't have a great range of facial expressions. But part of that is characterization, I guess. The whole robot/machine thing.
Anyway, elaborating a bit more on my impressions. Mitch was always portrayed as willing to sacrifice anything for the good of his city, as seen most vividly in his shunning of romance. It makes sense that his obsession with duty would drive him to take even more drastic measures when faced with global responsibilities, to the point of severing ties with, even killing old friends. And the possibility that he intentionally stole the election makes one wonder whether he ever was as good as we thought. I still think the dreams manipulated him into creating things that serve the enemies' purpose, while lying to him about their actual function. This also happened with the portal, which Hundred said worked as a ray gun while he was testing it out.
About him still being a bachelor at the end, was there ever a president elect who wasn't married? The question remained somewhat open on whether he's gay, so that may be figuring in. The biggest question though, is whether the immigrants will ever manage to come through, and whether Mitch will still be at least a shadow of the kind of person who is able/willing to stop them.