Well, the reports are that he wanted to change his pick. Which doesn't surprise me because he picked someone who is ideologically opposed to most everything has said. It's believed he wanted Christie, but Ivanka (who is the real head of his campgan) wanted Pence.
Trump had months to figure this out.Trump changes his stance on almost everything anyhow, so yeah, he likely changed his mind on this too and really does regret picking Pence.
I think he also used all of it to max out the news coverage and attention for him more than anything else. He's a drama king. He played up his lack of confidence in his choice on TV interviews the very night of the announcement.
I've talked to so many Trump supporters. What they see in him is what most people fear: he's a strongman. He consistently promises one thing: he will take control, all the control. This is attractive to Trump supporters, and is what most people fear about him.
Pence is a really strange and alarming pick. I know I keep saying this, but the more I read about Pence, the more I'm concerned about him. He's the most extreme VP choice ever. He's so far right, most Republicans don't like him. Pence is extreme in his beliefs.
Extreme right leaders + nationalism + white supremacy is what lead to the Nazi's.
So. That's where we are at. :(
Some happy news: Gary Johnson's numbers continue to rise. Even if Johnson doesn't win, this is still a good thing. It is reflecting a string pull away from statist type of leaders like Trump. Libertarianism is the opposite of statism - and Trump is a statist through and through. Johnson's numbers rising mean that Americans are waking up and realizing statism is a bad idea. The more that libertarian ideas become increasingly popular, the less popular Trump, and even more his ideas, will be and the less damage they can do.