NASHUA, N.H. (AP) - Republican front-runner Mitt Romney stumbled down the homestretch of the New Hampshire primary on Monday, declaring, "I like being able to fire people who provide services to me" as his rivals intensified already fierce criticism. "Gov. Romney enjoys firing people. I enjoy creating jobs," said former Utah Gov. Jon Huntsman, who has staked his candidacy on a strong showing in Tuesday's primary and has shown signs of gaining ground in recent polls. Adding insult to any injury, Texas Gov. Rick Perry posted a ringtone to his campaign website that consisted of Romney saying, "I like being...