10/05/2014 11:41 pm ET Updated Oct 05, 2014

A Really Small Slice Of Americans Get To Decide Who Will Rule The Senate

The U.S. population is about 319 million, according to the U.S. Census. Of course, only a fraction of Americans will actually vote in November's election. How small? To get an idea, look at the last midterm election, in 2010.

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