Mikhail Gorbachev, former Soviet leader, dies at 91

Former Soviet Union leader Mikhail Gorbachev, one of the most influential politicians of the 20th century, has died. He was 91 years old. Charlie D'Agata looks back on his life and influence. #MikhailGorbachev #russia #news "CBS Evening News with Norah O'Donnell" delivers the latest news and original reporting, and goes beyond the headlines with context and depth. Catch the "CBS Evening News" weeknights at 6:30 p.m. ET on the CBS Television Network and at 10 p.m. ET on the CBS News app.