Why the Iowa caucuses are so important: 5 theories

There are several good reasons why we give so much power to a sparsely populated, overwhelmingly white state in the middle of the country... right?

Iowa will hold its first-in-the-nation presidential caucuses on Tuesday evening: The Hawkeye State has voted first since 1972.
(Image credit: REUTERS/Brian Snyder)

The griping about Iowa's entrenched pole position in the presidential primary race is almost as old a tradition as the state's first-in-the-nation caucuses themselves. The Hawkeye State is too sparsely populated, too white, too conservative, and too rural to have such an outsized influence on presidential nominations, and it often fails to pick the eventual winner, critics say. Still, for every presidential election since 1972, Iowa has gone first, and with good reason. Here, five arguments why the first-in-the-nation caucuses Iowa will host Tuesday evening are so important to this year's GOP field:

1. Iowa shows which candidates can "go the distance"...

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