BOSTON (CBS) – On Saturday, Democratic presidential candidate Bernie Sanders drew thousands of supporters on Boston Common ahead of the Massachusetts primary set for Super Tuesday.

Victoria McGrane, a political analyst and reporter for the Boston Globe told WBZ-TV’s Jon Keller it was a “power move” to hold that rally and a Friday event in Springfield in the home state of Elizabeth Warren.

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“It is definitely a big move, a power move by the Bernie Sanders campaign. I think it reflects that whatever numbers they’re looking at, they think they can beat her in Massachusetts,” said McGrane.

Keller @ Large: Part 2

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An exclusive Suffolk University/WBZ/Boston Globe primary poll released Saturday night found Sanders holding a narrow 2% lead ahead of Warren. Sanders’ edge is well within the survey’s 4.4% margin of error.

McGrane said a Sanders victory in Massachusetts would be a major setback for Warren’s campaign.

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“That would be a tough blow for the Massachusetts senator to not win her own state, and she hasn’t won any states so far,” said McGrane.

Jon Keller