Does the heaving bosom play well among Bible Belt Republicans? Among New Hampshire primary voters? How else to explain, as debate week begins, the bursting out all over by GOP front-runners’ wives? What’s with this ample - and aging - display of decolletage? Mrs. John McCain, 52, just gave Fox News’ Greta Van Susteren an at-home tour wearing this tight, bubble-gum-pink wraparound shirt cut to her sternum. Three inches of cleavage. Poor Greta, the consummate professional in blue blazer and yellow button-down, didn’t know where to look. Meanwhile nearly half the pictures you see of Judy Nathan, aka Mrs. Giuliani,...