How good is Iowa at picking White House winners?

Aired: 2/1/2016 | 0:02:23 | Clip
How well do the Iowa caucuses predict success for a presidential candidate? Hari Sreenivasan and the NewsHour data team take a look at that state’s track record, what Iowans are posting on social media and how well these voters match up to the country’s demographics at large.

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