In Iowa, Clinton holds an eight-point advantage over Bush, 48 percent to 40 percent, and an 11-point edge over Walker, 49 percent to 38 percent.In New Hampshire, Clinton is up by six points over Bush (48 percent to 42 percent) and seven points over Walker (49 percent to 42 percent).And in the GOP-leaning state of South Carolina, Bush leads Clinton by three points, 48 percent to 45 percent. And Walker ties her at 46 percent each.