Warren is currently projected to lead the race with 33 percent of the vote, while former vice president Joe Biden follows with 18 percent of the vote and Vermont Sen. Bernie Sanders is predicted to take 13 percent of the vote, according to a recent poll.

With the preliminary municipal election coming up at the end of the month, the four candidates for Mayor of Boston — including incumbent Mayor Martin Walsh, District 7 City Councilor Tito Jackson, and...