In potentially the first inter-staff dust up of the 2012 presidential race, an aide of Sarah Palin is hitting back at Mitt Romney’s camp for saying the former Alaska governor is “not a serious human being.” Asked about the comments by POLITICO, a longtime Palin aide unloaded on Romney’s staff. “It shocks me that anyone would try to do that,” the aide said. “You’d think we’d all be working together toward a common goal – that being 2010 – and that should be the focus right now. Those who try to claim the mantle of Reagan would be good to...