Maybe I’ve just been lucky. But I never before have been compelled to consider who’s the dumbest Los Angeles City Council member. It’s not as important as knowing who’s the smartest, or most venal. Or least honest.As the fiscal year wanes, however, I think we do need a tentative negative-intelligence assessment. So here we go: The least cerebral person sitting on the ruling body of the nation’s second largest city is 15th District member Rudy Svorinich. He proved this last week when he got in way over his head on a major issue and forgot to tread water.”I wonder if this is not one of the most gross attempts to change the way the city of Los Angeles is being run in the future,” Svorinich said Friday. He was speaking of a political contribution of $200,000 by Rupert Murdoch’s DLO Corp., the political contribution arm of Murdoch’s News Corp.