As I said earlier in another thread, Trump answered the question very well actually and it was a question that was asked of others in the past.

The press is making more than ever about it, but what he said was.....he would support the Republican candidate if he 'respected" that person.

Later in the debate, he went out of his way to look at Jeb Bush and say how much he respected him.

He has leverage now and why throw it away....he likes the attention and it does in fact give him power within the party. We are OVER A YEAR away from anything so it is positioning now.

"Donald Trump told Sean Hannity tonight that he wouldn’t make the pledge to support the nominee and not run third party because he’s using it as leverage with the Republican Establishment. He says he’s starting to like the establishment and may at some time make the pledge. But for now he sees the leverage is important and won’t give it up."

Read more: TRUMP on Third Party Question: Why should I give up my leverage with Republican Establishment? » The Right Scoop -