Washington (CNN) It is the political math driving Campaign 2016: Anger + Anxiety = Unpredictability.

Focus on the horse race numbers and you will see, in that snapshot of the moment, that Donald Trump is losing ground, and that a Joe Biden campaign could make Bernie Sanders more competitive.

Look deeper, though, and you get a better sense of the remarkable voter mood that is driving the surprising twists and turns the presidential race is taking in its early months.

Why are voters looking for something -- and someone -- different?

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