In a moment that compressed months of political drift into a single image, Pennsylvania Democratic Senator John Fetterman appeared by video at the Republican midterm convention in Dallas, introducing a GOP colleague with language that sounded more at home among conservatives than within his own caucus. Fetterman, who has long cast himself as a 'common-sense Democrat' at odds with his party's progressive wing, has watched his approval among Pennsylvania Republicans surge while Democratic support has collapsed — a realignment that raises enduring questions about where loyalty ends and identity b