Former Massachusetts governor and 1988 Democratic presidential nominee Michael Dukakis will formally endorse Rep. Mike Capuano in the Democratic primary for the Senate special election Sunday at an event in Brookline, Mass.

Dukakis, the state’s longest serving governor after serving from 1975-1979 and again from 1983-1991, joins his wife Kitty, in endorsing Capuano in the four-person race. The primary election is Dec. 8.

In a statement issued by the Capuano campaign, Dukakis said he met the six-term congressman “as a young staffer at the State House,” then “watched him grow and develop into one of the best mayors in the Commonwealth” and “worked closely with him since his election to Congress.”