As reported on Elections Today:
This afternoon, however, a poll from Gravis Marketing showed a result that did not reconcile with recent polling. The poll, which some national and regional writers picked up on and reported, was faked by two confirmed twitter accounts: @JohnMcCormackMA (Account has been deleted) and @Kilometerbryman (Account has been made private).
Some locals were fooled by the poll's detailed graphics, even though some of the numbers were clearly at odds with other local polls:
Let the speculation on motivations begin!