Graphic Video of Capitol Attack Leaves Emotions Raw but May Not Change Votes

There was a lot to be shaken about. The footage from Capitol security cameras showed Vice President Mike Pence, who had alienated Mr. Trump’s supporters by refusing to try to overturn the election as the president had demanded, being rushed with his family by Secret Service officers down a staircase to escape invaders calling for his death. Young aides to Speaker Nancy Pelosi were shown scrambling into an office and barricading themselves inside just minutes before the mob arrived and tried to break down the door.

Other clips showed Eugene Goodman, a Capitol Police officer, facing the mob alone and encountering Senator Mitt Romney, Republican of Utah, and warning him about the danger, prompting the senator to abruptly spin around and run the other way. Likewise, Senator Chuck Schumer of New York, the Democratic leader, was seen being led away by his security detail only to suddenly realize they were heading toward the mob, forcing them to turn around and race in the opposite direction.

“They were within 100 feet of where the vice president was sheltering with his family, and they were just feet away from the doors of this chamber where many of you remained at that time,” Stacey Plaskett, a Democratic delegate from the Virgin Islands and one of the House impeachment managers, told the senators sitting as jurors.

She and other managers played police dispatch audio recordings and cited legal filings, social media postings and videos to make clear that the rioters posed a serious danger to Mr. Pence, Ms. Pelosi and other lawmakers as well as to police officers, some of whom sounded nearly panicked pleading for backup.

“Hang Mike Pence! Hang Mike Pence!” the crowd could be heard chanting. Outside the Capitol, where a gallows had been set up, others called out, “Bring out Pence!” One rioter taped a video saying, “He’s a total treasonous pig.”

They likewise were searching for Ms. Pelosi, and Ms. Plaskett pointed out that the intruder famously photographed sitting at a desk in her office was actually carrying a 950,000-volt stun gun. “Where are you, Nancy?” some of the rioters called out. “We’re looking for you!”

To make the point vivid, the managers created a graphic representation of the Capitol using menacing red dots to show the progress of the mob as it invaded the building and approached the chambers where senators and House members were meeting to count the Electoral College votes ratifying the victory of Joseph R. Biden Jr. over Mr. Trump.

“Again, that is a mob that was sent by the president of the United States to stop the certification of an election,” Ms. Plaskett told the Senate. “The vice president, the speaker of the House — the first and second in line to the presidency — were performing their constitutional duties presiding over the election certification and they were put in danger because President Trump put his own desires, his own need for power, over his duty to the Constitution and our democratic process.”

“President Trump,” she added, “put a target on their backs and his mob broke into the Capitol to hunt them down.”

The video footage was the culmination of a methodical presentation by the managers arguing that Mr. Trump’s incitement of the insurrection began months before Jan. 6 with the propagation of what they called the “Big Lie” that the election would be stolen if he lost. The managers laid out the timeline of the president’s efforts to rile up supporters, setting the stage for the eventual outburst of violence at the Capitol.

The president, they added, cared not about the havoc he had unleashed but continued to push his efforts to block the Electoral College count even after the attack began. The video showing Mr. Pence being evacuated was time-stamped at 2:26 p.m. — just two minutes after Mr. Trump posted on Twitter attacking his own vice president for not trying to overturn the election: “Mike Pence didn’t have the courage to do what should have been done to protect our Country and our Constitution.”

Even at that point, the managers told the senators on Wednesday, Mr. Trump disregarded pleas from his aides and allies to intervene to explicitly call on the mob to stop the attack, issuing instead only a belated and mildly worded video telling supporters to be peaceful and return home even as he embraced them. “We love you,” he said at the time. “You’re very special.”

Representative Jamie Raskin, Democrat of Maryland and the lead House manager, said that Mr. Trump bore responsibility for the actions of supporters who were acting on his false assertions of widespread election fraud that did not exist.

“Donald Trump surrendered his role as commander in chief and became the inciter in chief of a dangerous insurrection,” Mr. Raskin said. “He told them to fight like hell,” he added, “and they brought us hell that day.”