If you could select someone to be the leader of Earth...
...who would it be?
I'd select Barack Obama.
All time I'd go with Thomas Jefferson so long as he would accept slavery being over. He seemed to support it only because he thought getting rid of it would create too many problems, since it's already gone that would be a moot point. If not him than I'd bring back to life either Barry Goldwater or Reagan.
Living I'd probably go with Ron Paul. He probably wouldn't have worked out as president given the constraints of our political system, but as leader of the world he'd actually be able to make the world the way he wanted to be which I would fully support.