GOP presidential frontrunner Newt Gingrich still leads the Republican field in Iowa, but Mitt Romney and Ron Paul are back within striking distance, according to an American Research Group poll released on Monday. Gingrich took 22 percent of the support from likely Iowa caucus-goers, which is a five percent drop from the previous poll. Mitt Romney and Ron Paul both came in at 17 percent, followed by Rick Perry at 13 percent, Michele Bachmann and Rick Santorum at seven percent, and Jon Huntsman at five percent.