During a live post-debate "Kelly File," Frank Luntz talked to a focus group of voters from the key swing state of Florida.

The participants agreed overwhelmingly that Vermont Sen. Bernie Sanders was the big winner at the first Democratic debate.

Words that the group used to describe Sanders included strong, straightforward, confident, sincere, smart and direct.

As for the moment that generated the most positive reaction during the debate, participants agreed it was when Sanders addressed Hillary Clinton's email scandal.

"The American people are sick and tired of hearing about your damn emails!" Sanders said. "Enough of the emails. Let's talk about the real issues facing America."

Meantime, the reaction to Jim Webb and Lincoln Chafee was overwhelmingly negative.

Watch the "Kelly File" clip above.

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