Massachusetts Attorney General Maura Healey on Monday endorsed progressive congressional candidate Ayanna Pressley.

Pressley, the first woman of color elected to the Boston City Council, is taking on Rep. Michael Capuano Michael (Mike) Everett CapuanoHillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections 'Markeyverse' of online fans helps take down a Kennedy Inside the progressive hunt for vulnerable House Democrats MORE (D), who has held the seat for almost 20 years.

“Today, I’m endorsing Ayanna Pressley to be the next Congresswoman representing my district, the historic 7th District of Massachusetts,” Healey tweeted. “For me, this isn’t political, it’s personal.”

“Long before I ever thought of running for office, Ayanna Pressley and I worked together on issues that strike at the core of who we are as a city and a state and reflect the progress we still need to make,” Healey wrote in a second tweet.

Today, I’m endorsing @AyannaPressley to be the next Congresswoman representing my district, the historic 7th District of Massachusetts. For me, this isn’t political, it’s personal. #mapoli pic.twitter.com/1dXtQn4kWj — Maura Healey (@maura_healey) July 30, 2018

Pressley is calling for comprehensive gun control, "Medicare for all" and debt-free tuition. She has also expressed support for the movement to abolish ICE.

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The race has similarities to last month's New York congressional primary, in which first-time candidate Alexandria Ocasio-Cortez unseated longtime Democratic Rep. Joseph Crowley.

Ocasio-Cortez, a self-proclaimed democratic socialist who received help from Pressley’s field organizer, has already endorsed Pressley.

A recent poll showed Pressley within single digits of Capuano, though 33 percent of voters said they were still undecided.

The primary is scheduled for Sept. 4.