Sen. Bernie Sanders drew overflowing crowds to his Boston, Massachusetts presidential campaign rally Saturday night as he called for political revolution, racial justice, and gun law reform, among other progressive issues.

Tens of thousands of supporters turned out at the Boston Convention Center to see Sanders speak—skyrocketing numbers that are now typical for the senator from Vermont whose run at the White House for 2016 once seemed like a long shot.

According to campaign staffers, an additional 4,000 people joined an overflow room at the convention center after the main venue filled to its 25,000-person capacity, while others braved the cold to watch his speech outside on a Jumbotron. One attendee tweeted that at least 32,000 people had shown up to #FeelTheBern:

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“Welcome to the political revolution,” Sanders told the cheering audience.

He then launched into a critique of the U.S. justice system, which he described as “broken and… in need of deep reform.” He slammed “an institutional racism that allows and continues to allow unarmed African Americans to be killed by police,” referring to a recent spate of high-profile killings that galvanized the Black Lives Matter movement. He echoed many of that campaign’s demands, including accountability for officers and an overhaul of the prison-industrial complex.

“Our job is to make police departments look like the communities they serve,” Sanders said. “Our job is to make sure non-violent offenders do not get locked up, our job is to rethink the war on drugs, our job is to demilitarize police departments, our job is to end mandatory minimum sentences.”

And “when a police officer breaks the law that officer must be held accountable,” he said.