When Marty Walsh won the Boston mayoral race, US vice president Joe Biden was quick to pick up the phone to congratulate him.
But the Marty Walsh who Mr Biden had on the other end of the phone was not the Marty Walsh who had been elected to succeed long-time Boston mayor Thomas Menino.
The Marty Walsh who Mr Biden called was actually a former aide to the late US senator Edward Kennedy.
Before that Marty Walsh could explain the mix-up, Mr Biden launched into his congratulations, saying: "Marty, you did it, you son of a gun."
Mr Walsh, who says he has received misplaced calls for the other Marty Walsh in the past, said he quickly set Mr Biden straight and passed on the mobile phone number for the mayor-elect.
He said Mr Biden then jokingly congratulated him for not being mayor.
Mr Biden's office did not immediately return a call for comment.