Libertarian presidential candidate Gary Johnson reacts as his microphone stops working during a campaign rally on Saturday at Grand View University in Des Moines, Iowa.
Libertarian presidential candidate Gary Johnson reacts as his microphone stops working during a campaign rally on Saturday at Grand View University in Des Moines, Iowa. Scott Morgan AP
Libertarian presidential candidate Gary Johnson reacts as his microphone stops working during a campaign rally on Saturday at Grand View University in Des Moines, Iowa. Scott Morgan AP

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