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Good Thursday morning. I'm Olivia Reingold, and this is your Politico Playbook audio briefing.

Note, as the video begins, we are seeing the inside view as the mob approaches from outside and beats the windows and doors.

The images were riveting.

Some senators leaned forward to get a better look,

identifying themselves in graphic videos of legislators sprinting down Capitol

hallways and members narrowly escaping out back doors.

Others looked away.

One senator was so shaken that he appeared to tear up.

That was the scene on Wednesday as House impeachment managers kicked off their case against

former President Donald Trump by making senators relive their worst nightmare, the January 6th insurrection at the very place they were sitting,

the U.S. Capitol.

Waves were made when this never-before-seen footage was presented.

Officer Goodman passes Senator Mitt Romney and directs him to turn around in order to get to safety.

On the first floor, just beneath them, the mob had already started to search for the Senate chamber.

Minutes after seeing that video, Mitt Romney told reporters, quote, that was overwhelmingly distressing and emotional.

Politically speaking, no one appears to be struggling more with the trial than Bill Cassidy, who switched his vote Tuesday, declaring the impeachment trial as constitutional.

On Wednesday, the Louisiana Republican spent most of his

time either furiously taking notes or pacing in the back of the room, occasionally letting a loud

sigh slip. And when House impeachment managers played that video, he was seen shaking his head

often and crossing his arms, clearly disturbed by the footage.

Later that night, he told the press pool, quote, I'm here to uphold the Constitution. I'm

...