Warren is at risk of losing her home state, the latest indignity in her long slide in the polls in her own backyard. As recently as October, the two-term senator held a 20-percentage point lead over Sanders, according to a WBUR poll. In the latest version of the poll, released Friday, she trailed him by 8 points.

Now, in the run-up to the March 3 primary, Sanders is going all in on his bid to pick off Massachusetts, culminating in a four-day music and canvassing festival in Worcester that begins Friday.

“The trajectory for both Warren and Sanders follows national trends. October was the peak for Warren nationally as well, while Sanders is gaining everywhere lately. Looking inside the numbers, it’s young voters who are strong for Sanders in a really unique way. We saw that also in the Iowa and New Hampshire results, where nearly half the voters under age 30 were for Sanders in each state. So I don’t think this is unique to Massachusetts,” said Steve Koczela, president of the MassINC Polling Group, which conducted the polls.