Former Vice President Kamala Harris left former President Joe Biden off a list of her top three most effective U.S. presidents in an interview on Friday. She went on to name John F. Kennedy — also noting Lyndon B. Johnson, Kennedy's vice president, who took over the presidency after he was assassinated. I think it's one of the greatest presidents," Harris said. The list notably left off Biden, under whom she served as vice president. Harris took a series of left-wing policy positions during the conversation, and said she had not made a decision about 2028 yet.