The major problem -- one of the major problems, for there are several -- one of the many major problems with governing people is that of whom you get to do it; or rather of who manages to get people to let them do it to them.
To summarize: it's a well known fact, that those people who most want to rule people are, ipso facto, those least suited to do it. To summarize the summary: anyone who is capable of getting themselves made President should on no account be allowed to do the job. To summarize the summary of the summary: people are a problem.
From "The Hitchhiker's Guide to the Galaxy", by Douglas Adams.