What Does “Liberal” Mean in this Context?

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From the July 15 Hannity & Colmes program:

HANNITY: They found three massive underground tanks, each 60 feet long, 10 feet high, each with about 100 marijuana plants growing inside. The university’s plumbing and electric lines had been tapped into the water to heat the plants, and the tanks were accessible by a homemade hatch door and a ladder that the culprits used to climb down into their secret liberal lab.

COLMES: Liberal?

Media Matters for America: Hannity called marijuana lab “liberal”

Har-har-har! Good one, Sean! It’s a joke, right? Heheh.