Klobuchar viewed it as a way to unite the party and the country. Vermont Sen. Bernie Sanders sees it as an effort by "establishment" Democrats to block his path to the nomination.

"I'm not surprised," Sanders told 5 Eyewitness News in a one-on-one interview before he rallied his supporters in St. Paul. "The economic establishment, Wall Street and drug companies and the insurance companies and the fossil fuel industry, they don't want me to win. And many of the establishment Democrats don't want us to win."

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Sanders dismisses his fellow Democrats who say he can't win in battleground states that tend to be more moderate and are unlikely to support someone who proclaims himself a Democratic socialist.

"Well, I would say for a start look at some of the recent polls in battleground states where we are beating Trump in Wisconsin, beating him in Michigan."

Sanders won't predict whether the Democratic National Convention will turn into a messy contest for the nomination.

"I'm not going to speculate. I don't know what's going to happen tomorrow. I don't know what's going to happen in a few months."

Sanders says the race shouldn't come down to the "super delegates" chosen by the party.

"The candidate who goes into the convention with the most popular votes, with the most delegates (during the primary season) should be the candidate who gets the nomination," Sanders says.