UPDATED 4:30 p.m. | Boston Mayor Tom Menino (D) will endorse Democratic Senate nominee Elizabeth Warren Friday, the Boston Globe reports.

For months, Menino had been mum on his decision about an endorsement in Warren’s race against popular Sen. Scott Brown (R). But according to local media reports, he will support his party’s nominee.

Menino, Boston’s longtime mayor, controls a juggernaut get-out-the-vote operation in the state’s largest city. Earlier this month, he told reporters that when he backs a candidate, he gives it his all.

“When I get [into] a campaign, I never do it half-baked,” he said. “I do it all the way.”

And, in the end, Menino and Warren belong to the same party.

“He’s going to pull out all the stops because it’s good for the Democratic party,” said Massachusetts Democratic consultant Scott Ferson.

Roll Call rates the Massachusetts Senate race as a Tossup.