Washington Donald Trump on Thursday told Iowa's voters that those who support Ben Carson are "stupid" to believe the "crap" that is his life story, part of a dizzying rhetorical romp in which Trump offered his most animated attack yet on his closest competitor.<br />At one point, Trump walked away from the podium and flipped his belt buckle up and down to ridicule what Carson has described as a key event in his life: that Carson, as a boy, once tried but failed to stab someone only to have the knife broken by a belt buckle.<br />Moments later, Trump told the crowd in Fort Dodge that he could not possibly understand why anyone supports Carson, who is essentially tied with Trump for support in the first-voting state.
