OKOBOJI, Iowa (CNN) - Sen. Rand Paul brought his recent crusade for a more compassionate Republican Party to the northwest part of Iowa on Monday, appealing to a crowd of social conservatives at a fundraiser for Rep. Steve King.

The Kentucky Republican made his push for sentencing reform in the criminal justice system, the laws of which "disproportionately affect African Americans and Hispanics," Paul said.

"Until you show that you care about them and that you want to do something about them, you're not going to win," he told the audience. "So if we want to win, we're going to have to change."

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