Similarly, the only episode in recent history approximating the cloud hanging over the attorney general’s office occurred during the Watergate scandal. That attorney general chose to resign rather than fire White House special prosecutor Archibald Cox and impede an investigation reaching into the White House. This attorney general, by contrast, appears to be implicated in an investigation that reaches into the White House.

Finally, never in American history has a foreign power so deliberately, powerfully, and maliciously tried to distort the cornerstone of American democracy. Comey sent this point home in the hearing, declaring, “There should be no fuzz on this whatsoever. The Russians interfered in our election during the 2016 cycle. They did it with purpose. They did it with sophistication. They did it with overwhelming technical efforts. … It is a high confidence judgment of the entire intelligence community. ... It's not a close call.”

Comey’s testimony delivered a “shock and awe” campaign, FBI-style: calm, cautious, and candid, at once stoic and relatable. It was as though Comey were trying to reach through our television sets and shake the body politic into our collective senses.

And yet, his shock and awe testimony may not shock and awe for long. The biggest story of the day is how unlikely this is to remain the biggest story. In all likelihood, after the Twittersphere dies down, partisans will retreat to their respective corners and business as usual will return to Washington.

Why?

Because of something called the “normalization of deviance:” the more frequently exceptional things happen, the less we think of them as exceptional. Over time, we become desensitized to events that fall far outside the normal range—often with disastrous consequences. The space shuttle Challenger exploded in 1986 despite previous shuttle launches that revealed O-ring seals in the shuttle’s rocket boosters were cracking in cold weather. They shouldn’t have been cracking at all. But NASA “normalized” the poor performance of O-rings as acceptable and okayed the launch, even with record low temperatures forecast for liftoff. Seven astronauts, including Christa McAuliffe, the first teacher in space, were killed.

We experience the normalization of deviance in daily life, too. Ever hear a funny noise in your car? The first time, it seems alarming. After living with it for a few days, however, you think it must not be so serious after all. You tell yourself the car seems to be running just fine. You grow accustomed to the noise. After a while you don’t notice it anymore. And maybe the car really is fine. Or maybe the funny noise is an indication that the car is about to experience a catastrophic breakdown (which is what happened to me one night, when I assumed a strange noise in my car was really nothing, until the car broke down on the freeway, at night, in Los Angeles, “without warning.”)