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On Saturday, several Republican presidential contenders fought for an edge among motorcycles, puppies, war heroes and roasted pork, having swapped dark suits for blue jeans to meet Iowans eight months before they cast the first votes of the 2016 presidential primary.

Wisconsin Gov. Scott Walker and former Texas Gov. Rick Perry cruised to an afternoon presidential forum on Harley-Davidson motorcycles, leading separate rides of hundreds — many military veterans among them — as their Republican competitors chatted up would-be supporters over barbecue and potato salad.