GOP presidential contender Mitt Romney’s decision to campaign negatively in Iowa appears to have backfired, with a new Newsmax-InsiderAdvantage poll showing the former Massachusetts governor plummeting to fourth place in the Hawkeye State -- a swift decline that pollster Matt Towery describes as “imploding.” Romney’s lead in New Hampshire is evaporating as well, Towery adds. The InsiderAdvantage survey of 517 registered likely Iowa caucus-goers shows former House Speaker Newt Gingrich the leading choice of 27 percent of Iowa Republicans. He is followed by Texas Rep. Ron Paul at 17 percent, Texas Gov. Rick Perry at 13 percent, Romney at 12...