If Frank Luntz's focus group is in any way representative of the Democratic Party electorate, Bernie Sanders was the big winner Tuesday night.

During a post-debate focus group on Fox News Tuesday night, Luntz's focus group was nearly unanimous in their assessment that Sanders won the first Democratic debate in Las Vegas, Nevada.

Of the 28 Democratic voters in the group, about half indicated their support for Hillary Clinton before the debate, and only a select few of them continued to think so after the debate.

"So who won the debate?" Luntz asked the group.

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