Hickenlooper will speak at the Democratic National Convention Wednesday.

"I am supporting the President, obviously," Hickenlooper said. "I think that, while perhaps [he's] not perfect, I think he's done a pretty remarkable job given the conditions he inherited. I mean, he came into to a terrible mess."

Hickenlooper says he plans to keep a positive tone in his speech.

He said he's disturbed by the negative ads that are running this campaign season.

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