As an outsider (I'm Swedish), I struggle to keep track of domestic politics of the United States. I therefore also struggle to find out more about potential candidates for the future 2016 elections.
Are there any "likely" candidates springing up from either side? Of course Mrs. Clinton and Mr. Biden are potential candidates on the Democratic side, and the Republicans may have potential candidates in for example Ted Cruz. What other names are likely candidates for either side? We're just two years away from a switch of President anyway.
Obama is going to violate our constitution and force everyone into allowing him to run for a third (3rd) term, which is in violation of our governmental system, at which time he will declare himself to be the King of the USA.
Within a very short but unspecified period of time, Obama will attack the rest of the world (with the help of the United Nations) and institute a world wide socialistic empire.
But... to answer your question: For the Democrats there is only Hilary Clinton. If she runs, she will win.
If she choses to not run for office, the front runner will be Biden. He would also most likely win.
For the Republicans.... they more or less have the Three Stooges as their candidates.
The Tea Party.... they have some drunk insane psychotropic taking nitwit who can barely tie his/her own shoe laces.
The good news is that if the Tea Party/Republicans win... we will all have a lot of fun... at the expense or the middle and lower classes of the USA.