Various media outlets are reporting that Connecticut Senator Joe Lieberman will not seek a fifth term. Lieberman became an independent in 2006 (after losing the Democratic primary) and won re-election; he was also on Senator John McCain's VP shortlist and spoke at the 2008 RNC. The NY Times reports that he "chose to retire rather than risk being defeated, said the person, who spoke to the senator on Tuesday," and a source said, “I don’t think he wanted to go out feet first." Lieberman will making some sort of announcement tomorrow.