Maryland gubernatorial hopeful Anthony G. Brown makes a direct appeal for votes in the June 24 Democratic primary in a new television ad that his campaign said is part of his closing message.

“The reports say we’ve built some of the best schools and one of the strongest economies in the nation,” Brown, the state’s lieutenant governor, tells viewers as soft music plays in the background. “But I say it’s not enough until every child has a world-class education, until every Marylander has an opportunity at a quality job.”

The 30-second spot, which also prominently mentions Brown’s endorsement by The Washington Post’s editorial board, is airing in both the Washington and Baltimore media markets, according to Brown’s campaign.

A Post poll released this week showed Brown with a commanding lead in the Democratic primary. Forty six percent of likely Democratic voters support Brown, while 23 percent back Attorney General Douglas F. Gansler and 16 percent support Del. Heather R. Mizeur (Montgomery), according to the poll.

On the eve of the start of early voting in the primary — which begins Thursday — Brown also released the names of an additional 26 endorsements from elected officials in Maryland. The list includes state legislators and county-level officials.