IMHO it'a fair to say that the AMA represents most US physicians- 250,000 of them. If you read the summary of the AMA's 2009 Annual General Meeting, it doesn't support every aspect of the plan but it does specifically support most of the proposed Medicaid and Medicare expansions.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
