The future of the position was suddenly rendered uncertain after Rep. Joseph Crowley (D-N.Y.) was upset by 28-year-old political newcomer Alexandria Ocasio-Cortez in the June primary election.
The apparent drive-by shooting occurred in Lomas de Chapultepec, an upscale neighborhood in Mexico City, authorities said.
The man was unconscious by the time deputies arrived, authorities said.
Political scientist Jerzy Targalski soldiered on with the interview, despite serving as a human cat condo.
"Bookshops are all about ideas and tolerating different opinions and not about verbally assaulting somebody, which is what was happening,” the owner of Black Swan Books told the Richmond Times-Dispatch.
One of the drivers fled the scene on foot after the crash, the Secret Service said.
"Today was the attention getter, but now comes the action,” said the Rev. Michael Pfleger, who helped lead the peaceful protest across one of Chicago's busiest highways.
Jason Roche, 41, has been charged with first-degree murder for the shooting of 19-year-old Devonte Ortiz in a dispute over Fourth of July fireworks, police said.
Conspiracy theorist Alex Jones falsely claimed Democrats were planning to wage civil war on July Fourth. A viral hashtag imagined what such a war might look like.
No one was injured, and no arrests were immediately made.