Barney Frank has endorsed fellow Rep. Ed Markey (D-MA) to become the next senator from Massachusetts.

"Ed Markey should be and will be the next senator. Ed and I have worked together in Congress and, before that, in the legislature," Frank said on MSNBC's "The Last Word" Wednesday night. "I would like to think of this as something of a kind of a relay team."

Frank reiterated that he wants to appointed interim senator between John Kerry's anticipated departure to become secretary of state and the special election to fill his seat.