US Representative William Delahunt said yesterday that he is considering retiring from his congressional seat representing the South Shore and Cape Cod, although he portrayed his deliberations as routine and said they are not related to challenges from Republicans who are energized by Scott Brown’s upset victory in last month’s special Senate election. Discuss COMMENTS (150) Related Photos Kennedys in public life Pondering a Congress without Kennedys McGrory: With iconic father gone, son seeks his own path Colleagues ponder Kennedy’s future, praise work ethic Rep. Kennedy lacked ‘fire’ for another race Kennedy out, R.I. voters say change is in the...