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Mel Evans, File, Associated Press
FILE - In this May 11, 2016 file photo, Democratic presidential candidate Hillary Clinton speaks during a campaign rally in Blackwood, N.J. For Clinton, whether she is competing against Bernie Sanders or Donald Trump, one concern is much the same. They are outsider candidates riding a wave of populist excitement, while she is viewed as a traditional, establishment choice. As a result, her campaign sometimes just looks a little less exciting.

DES MOINES, Iowa — Rock concert rallies versus intimate town halls.

Adoring groupies versus committed voters.

Sweeping promises versus pragmatic proposals.

It doesn't matter whether Hillary Clinton is competing against Democrat Bernie Sanders or Republican Donald Trump — one concern is much the same.

Sanders and Trump are outsider candidates riding a wave of populist excitement. Clinton is viewed as a traditional, establishment choice.

Clinton has won far more votes than any other 2016 candidate. But if she moves into a general election matchup with Trump, she may continue to be dogged by questions about voter enthusiasm — especially as Trump pledges to continue his raucous rallies.