You have to see this to believe it.

Once the linchpin of MSNBC's lineup of progressive hate-mongers, Keith Olbermann -- remember him? Neither did we at first -- is now reduced to being a "Special Correspondent" for GQ, a leftist propaganda organ masquerading as a men's fashion rag, making video commentary hilariously called "The Resistance" in which he hurls invective impotently at Donald Trump from what looks like a card table set up in his basement.

In the most recent episode of "The Resistance," Olbermann explains to GQ's smug, narcissistic audience "Why Donald Trump is Not Fit to Be President" -- namely, that Trump is mentally ill. 'This is not funny," Olbermann insists unconvincingly. "This is an existential threat to the United States of America," he warns, and the sooner we acknowledge that Trump is insane, the sooner we can avert a "disaster which could threaten the safety of every American -- indeed, the safety of every person on the planet."

In the process of ratcheting up the fear-mongering about our "insane Commander-in-Chief," Olbermann predictably compares him to the whole range of modern tyrants from Stalin and Hitler to Pol Pot and Castro, who collectively were responsible for literally countless millions of deaths. Donald Trump not only hasn't put anyone to death, he hasn't even moved into the White House yet.

Ironically, as Olbermann goes on for over 4 minutes screaming about the President-elect's "dangerous psychological impairment" and "full-on malignant narcissism," he comes increasingly unglued, gesticulating feverishly and shouting in an hysterically urgent delivery. It culminates in the command to "Resist!" before signing off with "Peace" and a hand gesture that comes this close to resembling the Vulcan "Live long and prosper."

Check out the video above for a jaw-dropping look at Keith Olbermann's questionable mental state.