Newt Gingrich got in hot water during his 2012 presidential race for using campaign funds to pay himself $47,000 for a mailing list.

I think politically there is less juice to be squeezed out of that orange in the Democratic side. I mean, my feeling is your median Democratic voter, they`re angry at the banks or they`re not psyched about companies that outsource and things like that.

There`s a lot in common between the Trump phenomenon and the campaign for Britain to exit the European Union, known as Brexit.

Once you start thinking about growth of economy, it's hard to think about anything else.

David Frum has been saying - [Donald] Trump is all about conservatism as identity, not conservatism as ideology.

It's not uncommon for revolutions to stem from a radicalized group just outside the circle of power. That's what the French Revolution was all about; that's what the American Revolution was. The question is: Will all those groups, because of the nature of partisan polarization and ideological polarization, just fight each other? Or is there capacity to organize?

The other theory of the case - and it`s not just one that people opposed to him politically believe, but also people who share the Republican Party`s beliefs or conservative, but don`t like Donald Trump, is that he`s fundamentally a narcissist who has become addicted to the attention, is sort of compulsively driven by attention, and this has given him an outlet for that attention, and crucially doesn`t actually care about the party that he is nominally representing.