which might go without saying - but I have to say if I somehow was notified I'd have a chance to sit down with the president for a talk, the first thing I'd ask is if Michelle could be there too!
But the main reasons would be for how he has dealt with all the various problems of the country. Anyone who has followed politics closely over the years knows how difficult the job is when a variety of things are going on at the same time - both Carter and Clinton ran into trouble with too many balls in the air at once, and I don't think either bush could do more than one thing at a time. Obama seems to have developed the ability to manage a great deal more at once than might be expected, while running circles around the opposition party in congress.
Then for his backbone, courage and advocacy of the core principles of the party of inclusion and equality. He has taken it to a new level, and this is the cause of a great deal of desperation on the other side. I think in some things history just takes its course and the president doesn't matter that much, but in the things that matter, Obama has stood on the right side every time, and helped progress rather than mucked things up. (Thinking of all that could have gone wrong in Libya, for example, though Iraq could have gone very stupidly as well).
How much difference does it make to have someone in the white house that I actually admire? Its a big difference. The bush years were hard on the head and the heart - I don't want to go back to that!