Perhaps the finest actor of his generation, Leonardo DiCaprio has come a long way in the public's eye since he was initially dismissed as just another 'pretty boy' actor. His early roles, such as 'Romeo + Juliet' and 'Titanic' didn't help with his image, but as he got older and moved into grittier work like 'The Departed' and 'Wolf of Wall Street' people finally began to appreciate what a superbly talented performer he was.
As well as having a legion of fans and a wealth of life experience, DiCaprio has enough political insight to stage a campaign. He's been involved in campaigning for the Democrats all his life, supporting John Kerry before doing the same for Barack Obama, although it's not known if he donated to Hillary Clinton. He's also known as a keen campaigner for environmental causes, which would likely form the basis for his campaign. DiCaprio wants to save the world. Maybe we should let him try!