“I think I just heard Senator Brown say that instead of working for the people of Massa­chusetts he’s taken a pledge to work for Grover Norquist, to make sure that no tax deal occurs that costs millionaires or billionaires even one dollar more,” Warren said.

Brown threw one of the few personal barbs of the night when he criticized Warren’s salary at Harvard Law School, saying lucrative pay is partly responsible for the rising cost of higher education.

Warren responded by pointing out that she got her education at “a commuter school,” the University of Houston, and is proud to have made it to Harvard.

The debate was sponsored by a Western Massachusetts media consortium.

The rivals, engaged in one of the most closely watched, expensive Senate contests in the country, will face off only once more, a week before the election.