Mon Nov 25, 2013 07:11 AM CST

ALTOONA, Iowa (AP) -- For decades, presidential candidates' chances in Iowa were wounded if not doomed unless they backed federal support for ethanol, a boon to the state's corn-growing economy.

That rule of politics collapsed resoundingly in the 2012 campaign when five of the six top Republican candidates said it was time for such intervention in the private market to end.

Now, Iowa's senior political leaders are pondering how to shore up political support for the corn-based fuel at a time when its economic and environmental benefits are under attack.

The latest blow came this month, when the Obama administration ...

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