It's pretty heard to say, so early out. Heck, it's usually pretty hard to say right before the elections. I found a list of some potential candidates. Some people say that Oprah has hinted at it. I think that's fairly unlikely, but if she ran, I think she'd have very big success. Dwayne "The Rock" Johnson has talked about running for president too. I think he could also have some good potential. Perhaps we'll see Trump come up against Romney, just like Obama did. I hope that Romney would have a better chance after all the ridiculous things Trump is doing.