To the surprise of no one, Attorney General Maura Healey of Charlestown announced this morning that, yes, she's running for governor.
It's become a tradition in Massachusetts: Whoever becomes attorney general eventually runs for governor. But Healey will be trying to break another tradition: That an attorney general who runs for governor loses:
Healey's predecessor, Martha Coakley, didn't learn from her losing Senate campaign and ran for governor in 2014. She lost to Charlie Baker.
Coakley's predecessor, Tom Reilly, didn't even make it that far - he lost the 2006 Democratic primary to Deval Patrick.
Reilly's predecessor, Scott Harshbarger, lost to Paul Cellucci in 1998. Harshbarger became AG by defeating James Shannon in the Democratic primary. Shannon is the exception that proves the rule: He didn't run for governor while attorney general.
Shannon took over from Francis Bellotti, who tried to get elected governor twice, losing both times in the Democratic primary, first to Kevin White, then to John Silber (neither of them got elected governor, either).
Bellotti took over from Robert Quinn, who lost to Mike Dukakis in the Democratic primary in 1974.
And Quinn took over from Elliot Richardson, yes, the Nixon Saturday Night Massacre Richardson, but he never ran for governor.
Before that, people who served as AG split between running for governor and the senate (think Edward Brooke). In 1958, then AG George Fingold, a Republican, started running for governor, but he died before the primary.
The last Massachusetts attorney general to get elected governor was Paul Dever, although he was no longer AG at the time. Dever, elected attorney general in 1934, ran against incumbent Gov. Leverett Saltonstall in 1940, but lost. After a World War II stint in the military, he ran for lieutenant governor in 1946, lost, then ran for governor in 1948 (back when governors were elected every two years) and won (and then, in 1952, he ran for president, and well, you can guess).
All of the above is from the Wikipedia list of Massachusetts attorneys general (yes, of course, Wikipedia has a list for that).