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Sanders apologizes to Clinton, supporters for data breach

Sanders apologized to Hillary Clinton and to his own supporters after his aides improperly accessed proprietary voter lists created by Clinton's campaign.
Bernie Sanders offers an apology to Hillary Clinton during a Democratic presidential primary debate, Dec. 19, 2015, at Saint Anselm College in Manchester, N.H. (Photo by Jim Cole/AP)
Bernie Sanders offers an apology to Hillary Clinton during a Democratic presidential primary debate, Dec. 19, 2015, at Saint Anselm College in Manchester, N.H. 
This article originally appeared on NBCNews.com.