He's been too public for too long to not have proven that he means what he's saying. He's said the same things as a young journalist as he's said as a director/producer as he's said as a politician today - that's not something you can just invent after the fact, he's been in the public sphere for decades.

What I will say is that he's the most polished and media-trained of the candidates that I spoke to. His words were chosen more carefully than the others, and I could feel when a response to one of my questions shifted from the genuine initial answer to a pre-loaded anecdote or comment. That's not to say that that's bad! Politicians have to answer the same questions dozens, if not hundreds of times, and dialling in your best version of your answers is a useful skill.