Of course, we're all familiar with how boldly the Democrats stood up to Joe Lieberman, the man who campaigned not only for the Republican presidential candidate but also numerous down-ticket Republicans. In the end, the Democrats welcomed him back with the same powers and privileges, even though he's quite likely to use those powers against them in the near future.
The last 20 seconds of the following video gives a good impression of what the negotiations were probably like:
Try to imagine the Democrats as Ted and Lieberman as Dr. Kelso. If you like, you can also imagine Dr. Cox as Obama, but that's stretching the analogy a bit too far, I think.