Considering that we haven't had one in all the years that I can remember, I've been voting since 1972, I can say that the people tend to vote for the person who is most charismatic rather than the one who is smart, honest, best for the country.
I think that they must understand the workings of the world but put country before wealth, fame, corruption and ego.
They should have a clear view of history and understand why we are where we are and be willing to accept that we aren't where we should be.
They should be willing and able to break away from convention and see a clear path beyond tomorrow.
IE; the Middle East, Most of the problems that are there today we put there decades ago. One has to look back further than Bush and Regan to the 40s and all of the huge mistakes made after WWII. Like propping up and supporting the Shah of Iran while taking without giving to the Iranian people. Look at how we supported Israel no matter how wrong they were and shielded them from every sanction every raised.
We need to look at the Vietnam war and how LBJ and the State Dept fabricated the Gulf of Tokin incident to put American military into the war.
Anyone looking at this can see the parallels and see that nothing good for the US will come from any of it.
Every president since JFK has given the Federal Reserve a walk. The FR has nothing to do with the Federal Government. It is a private corporation and we have never been allowed to look at their books let alone audit them!
JFK said he was going to boot the FR and that America should run its own banking and run our Mint. He was assassinated shortly after. I am not saying the two are connected but I wouldn't be surprised either. Some, who should know, said that JFK planned to pull all of the advisers out of Vietnam and get the US untangled from that mess as well. I do believe that he was killed for a reason and not because Oswald was a nut job.
Mostly we need a president who isn't corrupt... I've yet to see one.