Put a fork in him, he is done. This is more than a retrenchment, caucuses are one place where organization can trump name recognition.
The only thing that might bring his campaign now, is if Harry Reid sides with the telcos on the FISA bill, and Dodd actually has to physically filibuster.
Needless to say, I hope that Reid does the right thing, telco immunity takes the lawlessness of Bush and His Evil Minions™, and enshrines it into statute. It creates a precedent where any corporate wrongdoer can simply buy absolution.