To the left, a slippery slope is not a logical device, it’s their business model. Just in from (where else?) California:

Over the decades, this quiet coastal hamlet has earned a reputation as one of the most liberal places in the nation. Arcata was the first U.S. city to ban the sale of genetically modified foods, the first to elect a majority Green Party city council and one of the first to tacitly allow marijuana farming before pot was legal.