Knowing how to build a sucessful tech start-up and how to be a good president are two incredibly different skill sets. All of them are smart people so will have some much more interesting and thoughtful comments than the average bear but more interesting and thoughtful is a long ways off from saying most interesting and thoughtful. I also find it surprising that you left Bill Gates off because he seems to have the most relevant knowledge. Candidates have to slowly build respect and support within a major party over several years before they can have a shot at president. Politicians are by their nature safe and careful individuals when it comes to campaigns. There are a lot of ways to lose and only a few to win.