Or at least, Stuart Rothenberg thinks so. A snippet:
It seems as if every election cycle one supposedly safe Senator up for re-election somehow finds himself in an unexpectedly difficult race. In 2004, it was Bunning. In 2006, it was Sen. George Allen (R-Va.). Last year, Sen. Saxby Chambliss (R-Ga.) was forced into a runoff. It already looks as if Chris Dodd will join that select club next year.
Expect this report, which has a useful litany of Dodd’s problems, to add fuel to the speculation that Dodd may either choose to retire, be shown the door, or face a significant primary challenge.