Grossman noted that he had known Markey for more than 40 years in his endorsement.
These endorsements come the day after Markey received the backing of a number of mayors and state legislators in the state.
And Sen. John KerryJohn KerryPentagon chief expresses doubt over cooperation with Russia in Syria Five decades of Democratic convention memories Three strategies to help Clinton build 'Team of Teams' MORE (D-Mass.), whose seat Markey is planning to pursue if Kerry is confirmed as secretary of State, as is expected, and Victoria Kennedy, the widow of former Sen. Ted Kennedy (D-Mass.), have all endorsed Markey as well.
That, coupled with the backing of the Democratic Senatorial Campaign Committee, makes him the clear front-runner in any potential Democratic primary. And most other viable candidates have already said they have no plans to run; state Sen. Ben Downing decided against it, and shortly after, Rep. Michael Capuano (D-Mass.) said he would not be entering the race either.
That leaves only Rep. Stephen Lynch (D-Mass.) as a possible primary challenger for Markey, and while sources say he has been preparing for a run by pursuing support in the state, particularly among union groups, he has not yet officially entered the race.