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Political consultant David Plouffe, President Obama’s former campaign manager, joined The Kelly File to give his take on the first presidential debate.

“The debate was really about winning undecided voters,” he said.

“[Hillary Clinton] needed to provide more enthusiasm for the Obama coalition” to support her this year, he said.

“The first 15 minutes were good for [Donald] Trump…then it was a disaster,” Plouffe said.

Plouffe added that his campaign was forthright regarding President Obama’s poor performance in his first 2012 debate against former Massachusetts Gov. Mitt Romney.

He warned that if Trump didn’t correct his shortcomings on Monday, as Obama had, it could doom his campaign.

“The thing I’d worry about if I’m a Republican is if Trump acts…and believes he did well…it’s going to be a disaster.”

He called the forum “one of the worst debates a party nominee has had,” pointing to Trump’s occasional interjections and what Plouffe called “his Iraq [war] craziness” where the candidate proffered that fact-checkers review an interview he had with Sean Hannity on the topic.

Plouffe said a key demographic to continue to follow are younger voters and those supporting former New Mexico Gov. Gary Johnson, the Libertarian nominee.

Despite recent polls showing the race tightening, Plouffe said Trump cannot possibly win Pennsylvania and that he sees Clinton as having a 100 percent chance to win the White House.

Watch the full exchange above and let us know what you think in the comments.

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