Did you know that legalizing gay marriage could turn the economy around? Well, don’t take my word for it, but Neil Patrick Harris presents a pretty convincing argument…in song. He and a whole slew of big name comedic actors, including Jack Black, John C. Reilly, Allison Janney, Maya Rudolph, Andy Richter, Margaret Cho, Kathy Najimy, Rashida Jones and Craig Robinson, have united for an exclusive video from FunnyorDie.com that functions as a hilarious and tuneful protest of Proposition 8. And the songs are well-written too, since the whole thing was conceived and written by five-time Oscar-nominated composer Marc Shaiman. Hairspray director/choreographer Adam Shankman directed it.

In additon to supporting a cause, the video provides another surprising reason for me to regain interest in Jack Black. He’s terrific as Jesus here, and thanks to other recent online performances, such as his silent turn as Ben Franklin, I have a newfound enjoyment of his talents. Maybe he can somehow limit his career to the web and I can ignore all the obnoxious films he’s made in the last decade.

Anyway, check out the Prop 8 musical after the jump.