Ted Cruz's Colorado Performance Makes Contested Convention More Likely

The Texas senator continues to gain ground on the current GOP front-runner Donald Trump.
4:24 | 04/10/16

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Transcript for Ted Cruz's Colorado Performance Makes Contested Convention More Likely
Let's talk about republicans now. Ted Cruz outmaneuvering Donald Trump. David Wright is in Colorado Springs covering it all. David, good morning. Reporter: I'm in Denver this morning, actually, Dan. This was a big victory for Ted Cruz. He's taking home about as many delegates from Colorado as he did from Wisconsin. And Wisconsin was considered a blowout. While Donald Trump is looking ahead to New York, determined to win big in his home state -- God bless the great state of Colorado. Reporter: -- The Cruz campaign has been quietly focused on smaller elections. Like this one at the Colorado state convention. No pauns in D.C. Reporter: Party activists auditioning. Giving ten-second speeches. For liberty, for Ted Cruz, for freedom! Reporter: Hoping to become Colorado's degates to the national convention. Ted Cruz won the lot of them. Last night, meeting with republican jewish leaders in Nevada, he laid out his plan. I believe the first ballot will br the highest Donald Trump receives. Reporter: Trump's best hope rests on winning 1237 delegates. It's getting harder and harder for him to close the deal. Yesterday, after days of closed door meetings with top advisers, he emerged to tour the 9-11 memorial in Manhattan. His first visit there. Afterwards, he quietly gave a $100,000 donation. The trump campaign admits it needs to take a more disciplined approach to the delegate selection process. Or they could be in serious danger of being outplayed here. The stakes are high for all the campaigns. Let's bring in chief white house correspondent, Jon Karl. Good morning, sir. How are you? Good morning. Excellent. Let's talk about the front page of "The Boston globe." Filled with satirical articles. Inside, a tough editorial. I says Donald J. Trump's vision for the future of our nation is as deeply disturbing as it is pro foundly un-american. Have you ever seen anything like this? This is dramatic. One of the items on the front page, trump on Nobel prize short list? Interesting. This is a brutally tough editorial. Very stark. It won't affect his supporters, obviously. They know what his positions are. They're not going to be deterd by what a liberal editorial page in Boston says. The point is, this is what your going to be seeing if he wins the republican nomination. This kind of attack coming from the democrats. I think we have only seen the beginning of what will go against trump. Zr trump did very well many Massachusetts. He sure did. One of his best states. Those are republicans voting. Let's talk democrats. Hillary Clinton, if he does not win majority of the pledged delegate this is summer, Bernie sanders' team is promising to have a contested convention. What is the likelihood of that happening? They want a contested convention, too. What's going on here? Bernie sanders could theoretically get there. To get to a lead in the so-called pledged delegates. The democrats have an interesting system. They have superdelegates that are elected officials and other party officials who with vote regardless of how their states voted. They're almost all for Hillary Clinton. Without those, she still has a big lead. And if you take them aside, Bernie sanders would need to win 57% of the delegates going forward. He would have to do better than he has been. How does he look in New York? He could pull it off. It would be a big upset. He's never won a state as diverse as New York. He's got the Brooklyn accept down. He eats pizza the right way. Jon will be part of "This week" later this morning. George stephanopoulos will talk to Bernie sanders about his campai campaign strategy. Later this morning. Jon, thanks again. New revelations about the Brussels bombings.

This transcript has been automatically generated and may not be 100% accurate.

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