I know a few people that have met and worked directly with Michael Bloomberg. They have said very good things about his management abilities and strategic thinking. Plus, his socially liberal / fiscal conservative approach doesn't bother me nearly as much as the opposite. While I would like to see more socialism in this country, I think that a good leader with a good, pragmatic approach would suit me ok.
Oh, and I don't really trust Hillary.
Here's a link to his stances:
http://www.ontheissues.org/Mike_Bloomberg.htm I find that a lot of them are well reasoned. Add in some more income inequality stuff, and I'd be pretty happy with him.