Gabby Giffords gets mean

Gabby Giffords, irreproachable figure of sympathy, has fashioned an improbable new role for herself this election year: ruthless attack dog.
The former Democratic congresswoman, whose recovery from a gunshot wound to the head captivated the country, has unleashed some of the nastiest ads of the campaign season, going after GOP candidates in Arizona and New Hampshire with attacks even some left-leaning commentators say go too far. And Republicans on the receiving end are largely helpless to hit back, knowing a fight with the much-admired survivor is not one they’re...