The same goes here. A hilarious, star-studded piece is this "Prop 8 The Musical". And it's a Funny Or Die exclusive (they're pulling illegal copies off of YouTube left and right). Sorta wish it came out when it mattered, instead of now where it won't have half as much effect. But, to be fair, most of these celebs were videotaping pro-Obama videos at the time.
But check it out, it's 3 minutes, features the following cast:
Jordan Ballard, Margaret Cho, Barrett Foa, J.B. Ghuman, John Hill, Andy Richter, Maya Rudolph, Rashad Naylor, Nicole Parker, John C. Reilly, Allison Janney, Kathy Najimy, Jenifer Lewis, Craig Robinson, Rashida Jones, Lake Bell, Sarah Chalke, Katharine "Kooks" Leonard, Seth Morris, Denise "Esi!" Piane, Lucian Piane, Richard Read, Seth Redford, Quinton Strack, Tate Taylor, Jack Black, Neil Patrick Harris, and Marc "Marc" Shaiman.