Democrats at the party’s state convention passed a resolution to oppose the legalization of slot machines in Massachusetts.

The resolution, which also called for opposing other efforts to raise more revenue through “addictive and predatory” gambling, was championed by Kathleen Norbut of Monson, a member of the Democratic State Committee.

She says it was designed to send a message to state lawmakers, who are expected to decide in the fall whether to legalize casinos.

John Walsh, the state party chairman, says the resolution shouldn’t be viewed as a blow to the Democratic governor, who supports casinos.