Democratic presidential hopeful and U.S. Senator John Kerry buys frozen yogurt cones for campaign workers, supporters and passersby, in Des Moines, Iowa, September 2, 2003. Slipping in the polls and searching for a spark to ignite his White House bid, the U.S. senator from Massachusetts formally launched his run for the Democratic nomination in 2004, drawing on his past as a war hero before heading to Iowa, site of the first major election test in January. REUTERS/Jim Bourg