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**