Bernie Sanders, Hillary Clinton Continue to Rally Voter Support

ABC News' David Wright and George Stephanopoulos report the latest news from the 2016 presidential campaign trail.
3:37 | 10/25/15

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Transcript for Bernie Sanders, Hillary Clinton Continue to Rally Voter Support
Now to 2016 and the race to the white house. Saying this is a big week for the democratics, is an understatement. Bernie sanders strutting their stuff at an influential dinner at Des Moines. David Wright has the very latest. Hi, David. Reporter: Hi, Paula, Hillary Clinton's enjoying a bit of a star turn here in Des Moines, introduced by two rock stars as you said, Katy Perry and bill Clinton, but this is not a coronation, it's clear that Bernie sanders wants to take that crown. Hillary Clinton brought out the big guns including a pop star dressed like a superhero. Note you're a firework ? Reporter: And former president now campaigning to be the first-ever first husband. I have never been the warmup act for Katy Perry before. Reporter: This was bill Clinton's debut on the campaign trail for his wife. Katy Perry's debut standing up for the Clinton campaign. I stand and I March with Hillary. Reporter: And lending her voice, too. ? Reporter: At the Iowa Jefferson Jackson dinner, Hillary Clinton did roar. We're going to build an America where a father can tell his daughter, you can be anything you want to, including president of the United States of America! Reporter: But she doesn't quite have the nomination locked down. Senator, everybody's saying it's all over, did you not get the message? Just seven points behind her in Iowa, Bernie sanders is still on the March. This is a March which will end up in a year when you'll join me in the white house. Reporter: At the Katy Perry concert, message -- feel the Bern. Clearly Bernie sanders does not plan to go gently into that good night. 99 days until the Iowa caucuses and it's going to be a tough fight, but it's Hillary Clinton's to lose now Dan. For more on the race to the white house let's bring in George stephanopoulos who will be hosting this "This week" later this morning. Let's talk about the republicans for a second. You have Donald Trump on the show this morning. One of the things that we have seen this weekend, he's stepping up his attacks on Dr. Ben Carson. He's going after Carson in the latest Iowa poll, Carson has pulled ahead of Donald Trump even though trump leads nationally. Trump actually questioned Ben Carson's religion. I don't know about that. We'll ask about Donald Trump about it. This morning, these are the two front-runners. Bernie sanders taking on Hillary Clinton as a candidate of polls not principals. That's exactly the attack that worked for Barack Obama at that same dinner back in 2007. We'll talk about that this morning. George, thank you. I want to remind everybody, George has a big show this morning, he'll be going one-on-one with Donald Trump, later this morning on "This week" right here on ABC. George, thanks again.

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

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