The Nation magazine beats up Lieberman in this slide show for his stand on the Democratic health care bill.  Note that there is no link or source provided the the statement, “public option will actually decrease the deficit.”  I guess The Nation considers the CBO as not reputable or a partisan research organization.

Just as healthcare reform seems to be inevitable, the man who
represents a party of one insists he will bring the process to a halt. Joe Lieberman
(I-CT) who normally votes with Democrats, says he will join a GOP
filibuster of any bill that includes a public option. He cites a
concern for deficit growth even though virtually all reputable,
non-partisan scoring says the public option will actually
decrease the deficit.