Senate Republican primary challenges

A historically large number of primary challengers have emerged against incumbent Republican senators heading into the 2014 midterms. However, some challengers are more viable than others, according to interviews with independent analysts and GOP strategists. Here's a look at those Senate primary races. Read related story.

Senate Republican primary challenges
Source:Staff reports. The Washington Post. Published on December 10, 2013, 8:38 p.m.

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