Jack Black has expressed fear that the U.S. presidential candidate Barack Obama will pull the plug on his band's upcoming campaign trail benefit concert when the Senator realises they've cursed every other politician they've supported.Black admits he and Tenacious D bandmate Kyle Gass don't have a very good track record when it comes to supporting high-profile political figures.He said; "We're going to do an Obama benefit on the 23rd of September at the Wiltern Theater in Los Angeles. He's the better candidate and more in line with our views... I'm just a liberal guy."We've been doing political benefits for years and it's an endorsement. I did it for (Senator) John Carey and that didn't work. We've supported lots of different causes; tried to legalise weed and that didn't work."You just keep on chugging away trying to do what you think is good. Maybe Obama is gonna say 'Do me a favour, don't do a benefit for me,' since we've effectively killed all the campaigns we've taken part in."

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