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LUXEMBURG, IA - MAY 9:  Iowa farmer Ernie "George" Goebel pulls a corn planter behind his John Deere tractor while planting corn in a field on the farm he was raised on May 9, 2007 near Luxemburg, Iowa. With the increase in demand for alternative energy some farmers have elected to switch to growing corn in order to produce the profitable ethanol fuel. In the nation approximately 90 million acres of corn are expected to be planted this season.  (Photo by Mark Hirsch/Getty Images) *** Local Caption *** Ernie Goebel
LUXEMBURG, IA - MAY 9:  Iowa farmer Ernie "George" Goebel pulls a corn planter behind his John Deere tractor while planting corn in a field on the farm he was raised on May 9, 2007 near Luxemburg, Iowa. With the increase in demand for alternative energy some farmers have elected to switch to growing corn in order to produce the profitable ethanol fuel. In the nation approximately 90 million acres of corn are expected to be planted this season.  (Photo by Mark Hirsch/Getty Images) *** Local Caption *** Ernie Goebel

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    Why is Iowa so important in Presidential politics?

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Why is Iowa so important in Presidential politics?

CNN Politics Executive Editor Mark Preston explains why Iowa is such a figure in Presidential politics.

Why is Iowa so important in Presidential politics?

CNN Politics Executive Editor Mark Preston explains why Iowa is such a figure in Presidential politics.