Political Science this is not a joke

Joe Biden flubbed the name of British Prime Minister Theresa May at a fundraiser Saturday night, calling her by former Prime Minister Margaret Thatcher's name.
Thatcher left office in 1990 and died in 2013. The mistake by Biden, 76, comes amid worries about his age after he slurred his words during his campaign announcement speech. Aides have shielded him from reporters. He leads early primary polls by a wide margin but the Democratic Party establishment has yet to swing behind him.
https://www.washingtonexaminer.com/news/biden-mixes-up-british-pm-theresa-may-with-margaret-thatcher-who-left-office-in-1990