I'm an atheist, but I would vote for Jesus, because he personifies all that is good in humanity, real or not, when he came along, he got rid of all of the crap that was in the old testement and reimagined the bible as the new testement (or at least it came about as a result of his teachings), he would preach tolerance and all that is good, I don't think he would teach that "gays are evil" as those sorts of writings were written at a time when everyone was intolerent of everyone else, as a race, we've come a long way since then, and I believe that should the second coming occur, Jesus' views would reflect how we've changed as a society.
However, Jesus running as president is perhaps a double edged sword, while his views and beliefs are something we should all follow, certain aspects of presidency such as the economy, are not something I would look to Jesus for, as his ideals are all based on social interaction, and a greater sense of pupose, for things that are beyond us as humans, as well as being nice to each other. Jesus may ask us to look at who we are as human beings, but I can't imagine him being the sort of person who would want to trouble himself with things such as money, that is better left to someone else, with a certain mindset, Jesus is about the personal level.