A poll out on Wednesday from the American Research Group has Mitt Romney leading the Republican primary field in Iowa, picking up 22 percent of the support of Iowa Republicans and 21 percent of likely caucus goers. Among likely Republican caucus goers, Michele Bachmann has 15 percent and Rick Perry is in third just behind with 14 percent. Bachmann won the Ames Straw Poll and had been leading ARG's poll in July, 21 percent to Romney's 18 percent. (Perry barely registered back then at 2 percent.) In the intervening months, it looks like Perry's picking up some of her former supporters, but not enough yet to boost him past Romney. Meanwhile, Herman Cain, who led the weekend's Florida straw poll, picked up just 6 percent of the support among likely caucus goers.