A controversial goal from striker Pawel Abbott gave Darlington a victory over promotion rivals Dagenham and Redbridge which left them fourth in the table.
Abbott got on the end of a long ball on 74 minutes, and finished well with the home side vainly appealing for offside.
Dagenham, who now drop out of the play-off zone, saw Paul Benson have one effort ruled out for offside and another disallowed for a push.
Ben Strevens went close to a late equaliser, but his shot flew wide.
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