Tight Primaries Shouldn't Worry Republicans

Don't overinterpret the smaller margins of incumbent victory in primaries.
Senate Minority Leader Mitch McConnell of Kentucky probably has less to fear from his Democratic challenger.

With the last potentially competitive Republican Senate primary in Tennessee today, Nate Silver looks at the numbers and declares that "the GOP still has plenty to worry about. There have been far more close calls to its incumbents than usual."

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