I respect Sagan enormously. His works have had a huge impact on who I am as a person. Nevertheless, there's no need to deify him, I think that's the last thing he would have wanted. That being said, I think he would probably not have made a good president.
Even so, his contribution to humanity was tremendous, we are very much diminished by his absence.
I'm interested in what aspects of Sagan you perceive as not being suitable for political leadership?
Not that I want to imply that I think he was suitable (I've never really considered that particular option) - but I do view with dismay what is typically seen as being required to be an effective politician and it is perhaps interesting to consider the alternatives.