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Story highlights

83% of voters aged 18-29 chose Sanders, according to exit polls. Sanders also won 78% of first-time voters

In a year that voters are craving authenticity and a break from the political norm above all else, Clinton's nearly three decades in the political limelight is a liability.

(CNN) —  

The Iowa caucuses were days away, and Hillary Clinton’s campaign had tapped “In the Attic” – a band of four 19- and 20-year-olds from Cedar Rapids – to warm up the audience before she, Bill and Chelsea took the stage.

Two days later, the band caucused for Bernie Sanders.

“We like Bernie, but we think Hillary is a solid candidate,” Grant Blades, the band’s 19-year-old frontman, told CNN in an interview in an effort to be diplomatic.

Then 20-year-old drummer Tanner Parks dropped it, saying, “OK, we are supporting Bernie.”

They aren’t alone in choosing Sanders. Tuesday night in New Hampshire, 83% of voters aged 18-29 chose Sanders, according to exit polls. And those voters were a full one-fifth of the electorate. Sanders also won 78% of first-time voters. The only age demographic Clinton won? People 65 and older.

New Hampshire primaries: 5 takeaways

Clinton acknowledged the gap in her concession speech.

“I know I have some work to do, particularly with young people,” she said. “But I will repeat again what I have said this week: Even if they are not supporting me now, I support them.”

The overwhelming support for Sanders – a disheveled 74-year-old who has spent two decades in Congress – among younger voters is perhaps the biggest challenge confronting Clinton’s campaign in the Democratic nominating contest. It also underscores the problem with what Clinton represents: In a year that voters are craving authenticity and a break from the political norm above all else, her nearly three decades in the political limelight is a liability.

“Hillary just seems like a normal Democrat, and Bernie seems a little revolutionary to me,” said Jonah Hunt, an 18-year-old high school senior in Rochester, New Hampshire.

For Clinton to win the Democratic nomination, or at least stave off a lengthy, damaging primary fight, she