The UMass-Lowell/Boston Herald poll showed Brown leading Warren among likely voters 49 percent to 48 percent. Warren has held a lead outside the margin of error in four of the seven polls released in the past week. The pair were tied in a Boston Globe poll, and a poll released by a GOP firm showed Brown with a slight edge.

The last Herald poll, conducted in September, showed Brown with a 4-point edge, indicating movement in Warren’s direction.

While other polls have shown Brown’s favorability slipping, he remains strong here: 54 percent of Bay Staters have a positive opinion of him.