Who is Lieberman Hurting?

Obama is meeting with Senate Democrats today to essentially beg them to save health care reform.  Which inspired in me an odd thought.

Most progressives, and not a few conservatives, think that Lieberman has been jerking Senate progressives around as payback for their support for Lamont.  Which reminds me who was one of Lamont's big supporters in the general--one Barack Obama.  This makes me wonder.  If it is pique rather than principle--a theory still unproven--then who is the real target of Lieberman's supposed ire?  If it's Obama, it's hard to see how this bill gets done--given Snowe's fairly hard core pro-choice creds, and Nelson's even harder-core pro-life demands, it seems that you can do a deal with one of them, but not both of them.