Through much of his campaign for the Republican presidential nomination, Mitt Romney has treated his party rivals more like pesky mosquitoes than serious political opponents. He's ignored them as much as possible and felt compelled to swat at them only when they tried to bite - which hasn't been all that often. [snip] - Mitt Romney: That silver-haired, portly fellow lunging at Romney's throat with fangs bared is Newt Gingrich, who has adopted the wounded-dog strategy after his fourth-place Iowa finish. That's unfortunate for Romney, who has preferred to focus on President Barack Obama while political action committees friendly to...