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US Republican Senator from Kentucky Rand Paul addresses the 2015 Conservative Policy Summit at the Heritage Foundation in Washington on January 13, 2015. Paul is a possible presidential candidate in next year's election.  AFP PHOTO/NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
US Republican Senator from Kentucky Rand Paul addresses the 2015 Conservative Policy Summit at the Heritage Foundation in Washington on January 13, 2015. Paul is a possible presidential candidate in next year's election.  AFP PHOTO/NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)

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    Rand Paul annoyed at vaccine controversy

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Rand Paul annoyed at vaccine controversy

John King, Nia-Malika Henderson and Olivier Knox weigh in on the Kentucky senator's comments on the vaccine debate.

Rand Paul annoyed at vaccine controversy

John King, Nia-Malika Henderson and Olivier Knox weigh in on the Kentucky senator's comments on the vaccine debate.