In a Tuesday Oct. 16, 2012 photo, farmer and philanthropist Howard Buffett is keynote speaker for Iowa Hunger Summit, hosted by the World Food Prize Foundation. As the Des Moines-based foundation prepares for its 2012 award ceremony, which will be attended by dignitaries including Secretary-General of the United Nations Ban Ki-moon, dozens of protesters hope to disrupt the activities. (AP Photo/The Des Moines Register, Steve Bullock)  MAGS OUT, TV OUT, NO SALES, MANDATORY CREDIT**
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