Boston Mayor Thomas Menino will endorse Democratic U.S. Senate candidate Elizabeth Warren.
A source tells WBUR that the mayor will endorse Warren Friday in Boston. The endorsement was first reported by the Dorchester Reporter.
Menino's predecessor and fellow Democrat, Ray Flynn, has endorsed Warren's Republican opponent, incumbent Sen. Scott Brown.
Warren and Brown face off in their first televised debate Thursday evening.
This program aired on September 20, 2012. The audio for this program is not available.