I think the Dems should keep Leiberman in their Caucus but stripped him of his chairmanship. This shows a "big tent", bipartisan approach but having a big tent does not imply leadership role should be handed over to those who did not support the party. Should he choose to join the Republican caucus instead for getting some senior status, it will show that he puts himself first while claiming he puts the nation's interest first - having exactly the same nonsense meaning as McCain's "country first" slogan.