During the George W. Bush era, liberal sportscaster-turned-political commentator Keith Olbermann regularly inveighed against the Republican president and his conservative supporters on the MSNBC network.

Mr. Olbermann is back in front of the camera, this time before far fewer eyeballs, and with a new Republican bête noire, presidential nominee Donald J. Trump.

In his maiden voyage for his new GQ web series “The Closer with Keith Olbermann,” the host charted “176 reasons Donald Trump Shouldn’t Be President,” denouncing the New York businessman as a homegrown enemy of “progress” and “democracy” in the vein of George Wallace or Joseph McCarthy, who, like them, must be “thrown out” by sensible Americans who denounce them.

Insisting that Mr. Trump is the “demonic messiah in oompah-loompah’s clothing” of a base of voters who “want few details and fewer facts,” Mr. Olbermann gave his viewers the charge that “we must stop him.”

“It is not pleasant, it is not fair that we have to do this, but it is our turn,” he said in the Tuesday video before laying out a litany of Mr. Trump’s transgressions, from his personal attacks on everyone from former POW John McCain to Pope Francis to supermodel Heidi Klum to a listing of his numerous “lies” about everything from his taxes to meeting President Vladimir Putin of Russia.

“The Republican Party has actually nominated for president an irresponsible, unrealistic, naive, petulant, childish, vindictive, prejudiced, bigoted, racist, Islamophobic, anti-Semitic, misogynistic, fascistic, authoritarian, insensitive, erratic, disturbed, irrational, inhuman individual named Donald John Trump,” Mr. Olbermann said as he concluded his 17-minute monologue. “This is madness. Any questions?!”

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