A week before Election Day, anti-gambling forces are launching their first television advertisement, hoping that a last-minute media push will help defeat a referendum to bring slot machine gambling to Maryland. The 30-second spot is to start airing today on Baltimore-area stations, said Scott Arceneaux of Marylanders United to Stop Slots. Legalizing slots will cost millions "in crime, bankruptcy and addiction," the ad's narrator says. A source with the campaign said the anti-slots group plans to spend about $200,000 on airtime between now and the election. The main pro-slots group, For Maryland For Our Future, started airing TV ads this month and has spent more than $1.5 million on radio and TV spots in the Baltimore and Washington markets.