I usually think of them as two groups.
There are the Marxists, who actually believe that after 100,000,000 dead they just need to fine tune the thing a bit and it will bring utopia instead of mass murder. These are the drug taking college sophomores, the Moveon/Answer type groups, and the aging hippie "revolutionaries".
Then are there are the purely corrupt opportunists. In this group I put the Clinton gang, and most of the congressional Democrats. They don't really believe most of the nonsense they spout. How could they? But it brings them money and power.
No doubt there is overlap between the groups, with greedy Marxists and delusionally idealogical opportunists galore. In any case, most of them do share one thing, in my opinion: a kind of mental illness characterized by hatred of authority.
Just my two cents!
LOL! pretty well put.