I must admit that I was riveted by Michael Cohen’s testimony Wednesday at the hearing convened by House Oversight Committee Chairman Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (D-Md.). As a witness, President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s former attorney — facing three years in prison for campaign finance violations and lying to Congress before — appeared contrite, sympathetic, sad … and devastating. It doesn’t matter how many times we have been told that President Trump is a serial liar, racist, narcissistic con artist, and crusher of small businesses — when these accusations and more are levied in live testimony, it’s stunning.

There were so many highlights of the hearing, it’s hard to recount them. But one of the most powerful was when Cohen told Trump’s GOP supporters on the committee that he once was just like them — committed to protecting the president at any cost. He regrets that, he said: “I’m not protecting Mr. Trump anymore.” For their part, the Republican members looked like they were in an episode of “The Sopranos,” each taking a whack at Cohen with a rhetorical bat for betraying the boss.

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Permeating the GOP members’ feigned outrage that a convicted liar could address Congress, while they defend a president who lies perhaps more than any other high-ranking public official in a Western democracy, was pretty rich. These people aren’t complete fools; they know Trump is a liar — but he is their mechanism to cling to power when demographics otherwise might doom the Republican Party.

Then, a light shined through the self-righteous hazing of Cohen that masqueraded as questioning: conservative Rep. Justin Amash (R-Mich.).

Amash showed how someone actually can exercise oversight responsibility and try to get to the truth, even if the truth might not be in his party’s short-term best interest. Amash asked Cohen the killer question: “What is the truth President Trump is most afraid of people knowing?” Cohen couldn’t answer this utterly probative question, because evidently Trump isn’t afraid of people knowing any truth. As Cohen put it: “When he says he could shoot someone on Fifth Avenue and get away with it, he’s not joking, he’s telling you the truth.” No, what Trump likely is afraid of is losing power, the power to intimidate.

Trump’s GOP supporters in Congress know perfectly well that all of what Cohen said is true — apart, perhaps, from his not having wanted a job at the White House. But they, too, are outraged by the possibility of losing power. Nearly every allegation about Trump that Cohen made during the hearing has been reported, in some form, before. And mostly, Americans have shown they’re pretty immune to accusations about the president — at least enough of them to allow him to continue to govern.

But, worrisome for the GOP: What if this is the last straw? What if the American people somehow wake up and, instead of seeing this whole thing as tribal politics, they start to truly examine the president’s behavior? What then? It is exactly what Rep. Stephen Lynch Stephen Francis LynchOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Official: Pentagon has started 'prudent planning' for full Afghanistan withdrawal by May Overnight Defense: Dems divided on length of stopgap spending measure | Afghan envoy agrees to testify before House panel | Trump leans into foreign policy in campaign's final stretch MORE (D-Mass.) so forcefully said to Cohen and the GOP chorus of Trump apologists on the committee: “[The House GOP members] aren't afraid you’re going to lie. I think they’re afraid you’re going to tell the truth.”

So here’s to Rep. Amash for showing everyone how to ask a meaningful question of a witness you may not like or trust, about a topic that’s difficult for your political party. See, it wasn’t so hard. Now if we just had 200 more like Amash, we’d actually have a House of Representatives.

Krystal Ball is the liberal co-host of “Rising,” Hill.TV’s bipartisan morning news show. She is president of The People’s House Project, which recruits Democratic candidates in Republican-held congressional districts of the Midwest and Appalachia, and a former candidate for Congress in Virginia. Follow her on Twitter @krystalball.