Mitt Romney is in the lead in Arizona, but Rick Santorum isn’t far behind. A new survey by the American Research Group shows that 38 percent of likely Republican primary voters in the state are behind Romney, while 31 percent support Santorum. The findings show a sharp change in voters’ attitudes since January, when Gingrich was tied with Romney at 32 percent. Now Gingrich is in third place with 15 percent. According to the poll Romney has won the support both women and Tea Party supporters, while Santorum is most popular among Arizona’s men.