[Barack Obama will have a big problem attracting the blue-collar Democrat voters he needs to win the presidency - they like guns and he wants to take them away.] As she clawed for survival against Barack Obama in Wisconsin’s Democratic primary this past weekend, Hillary Clinton lamely asserted her Second Amendment bona fides over that of her rival by claiming that she once shot a duck in Arkansas. As pathetic a pander as that tale was, it did serve to point out one gaping weakness in the armor of the Illinois senator, a man who must rely on blue-collar white...