The real problem with Donald Trump is, if you engage him, it will only make things worse. It's like - it's a little bit what you were taught as a kid to not engage the bully, because they will continue to pick on you.

It doesn't need to be deep and it doesn't need to be a 65-point plan, but just to give some concrete examples of how this economy is going to work for the people that feel right now it's not working for them, and then finally to get to central tension of this campaign. This is a presidential campaign where you have Americans now who want to see change. And Hillary Clinton is the status quo. How can she be both status quo and change?

The difference there is that the [Donald] Trump number on change is so much larger than the lead that the other two have in their lanes. And that's going to be the challenge for those other two going forward. The other challenge for Marco Rubio, and this assumption that you're just going to get all those Bush and Kasich voters.

Lots of people coming in and out the Trump Tower, not necessarily indicative of what Donald Trump policy is going to be. To have Al Gore one day, and the next day the head of ExxonMobil, what does that - what are you supposed to read into that about his stance on climate change? So, I think, again, it's going to be that the actions that he takes are significant.

It's never a good time, when you're the president of the United States and your own party is finding lots of different ways to distance themselves from you.

Even on Ben Carson, he's not exactly steeped in housing policy, but his statements on the issue have also been very conservative.

If you're Chris Christie, who is governor of New Jersey, a state that obviously was impacted by 9/11, this gives you an opportunity to talk about how, as governor, you had to deal with terrorism and security issues.