NASHUA, NH -- Newt Gingrich plans to open up what could be a bitter new front in his fight with Mitt Romney with an ad accusing Romney of allowing taxpayer dollars to fund abortion in Massachusetts. The new ad will run in South Carolina "soon," according the Gingrich campaign. The topic of abortion has emerged as a particularly contentious issue between the Gingrich and Romney campaigns. Gingrich's accusation is that Romney's universal health care plan in Massachusetts explicitly provides for taxpayer funding of abortions. Romney responds by arguing that a longstanding Massachusetts supreme court decision, which as governor he had...