MIT health economist Jonathan Gruber has been the go-to source that all the health care bill apologists point to to defend otherwise dubious arguments. But he has consistently failed to disclose that he has had a sole-source contract with the Department of Health and Human Services since June 19, 2009 to consult on the "President's health reform proposal."
He is one source for the claim that the excise tax will result in raises for workers (though his underlying study is in-apt to the excise tax question). He is the basis for the argument that the Senate bill reduces families' risk -- even if it remains totally unaffordable. Even Politico stenographer Mike Allen points to Gruber's research.