I don't really like any of those choices, but if I'd had to pick, I'd go with Charles Krauthammer. Because President Krauthammer just sounds good.
That is what you want to hear from a candidate.
Harry Reid. Because he's a former boxer and knows how to kick azz.
Romney is the most qualified for the job at this point. That includes many you did not list.
Nancy Pelosi, I just love her to DEATH>
I would pick a sock puppet over any of them.
None of the above