David Roberts, who is a writer at Vox who I like, had a line about the voter - your voters weren`t locked in the room with you, Republican establishment. You were locked in the room with them.

Like one of [Donald] Trump`s sons said this is a huge step down for him to run for president. Like he`s not doing it - let`s just be clear.

Something changed between the two men, namely [Donald ] Trump started slinging mud on Twitter about [Ted] Cruz`s wife, Heidi, including a mean comparing her looks unfavourably to his own.

I mean,[Marco] Rubio, he`s having fun. I`ve got to say I`ve never seen him enjoy himself out there so much. He`s found way to get under his skin. So, he`s found way to look like he`s somebody that is a force, which has hasn`t so far.

If anonymous [Donald] Trump campaign sources are to be believed, they`re pretty concerned he`s going to blow the big debate Monday night with an utter lack of preparation.

What the issue here is, you get rid of all the conservative orthodoxy about capital gains, marginal tax rate, supply side economics, you just throw all that out the window, limited government and you just embrace the sheer and raw politics of resentment that have been bubbling the whole time and that`s what you get. You get Donald Trump.

Climate change is the biggest governing challenge we face. It's the biggest governing challenge I think we've ever faced.