Bernie Sanders Continues Momentum With Wyoming Win

Sanders' campaign is threatening a convention fight if Hillary Clinton doesn't clinch enough pledged delegates in time.
2:28 | 04/11/16

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Transcript for Bernie Sanders Continues Momentum With Wyoming Win
Now to the democratic race, Bernie sanders notching another victory in Wyoming over the weekend. Winning the popular vote but splitting the delegates evenly with Hillary. Cecilia Vega is here with the latest on that. Reporter: Eight days. Good morning to you. Bernie sanders has been winning states seven of the last eight contests but that battle for delegates is an uphill climb. But he says he can still win this nomination. Thank you, Brooklyn! Reporter: This morning, Bernie sanders is riding high. Are you guys ready to go on the ride? Reporter: At the roller coaster at croniy island. Sanders now in a New York state of mind after a weekend win in Wyoming. The ride ahead even wilder. Sanders has a steep climb to pass Hillary Clinton with enough delegates with nomination. In the last 3 1/2 weeks, we have reduced her margin by a third. So, no question, the momentum is with us. Reporter: This morning, his team is promoting a contested convention. We're on the way of pulling off the biggest political upset in modern history of America. Reporter: Clinton insisting that will not be the case. I feel good about the upcoming contests. I intend to have the number of delegates that are required to be nominated. Bill Clinton on the stump, too, echoing his wife's confidence. She's 2.3 million votes ahead and 250 delegates a ahead. How can you ask that? Reporter: Hillary Clinton's focus now -- Donald Trump. She's taking him on in a new ad that hits New York air waves this week. At so much stake she's the one tough enough to stop trump. Also in that path, that subway turnstile. A real-life subway fail made for "Snl." I watched that so many times. It's so funny. Both sides overnight released ads. That one from Hillary Clinton, she's laser focused on Donald Trump. Bernie sanders put out a new ad overnight, celebrating his new York values. Living here in New York. We're seeing those ads over and over again. New York matters. Thank you, Cecilia.

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

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