Seriously, why fear a friendly AI? It will be hardwired to act in our own best interests. Human politicians aren't hardwired in this way. You won't be able to bribe such an AI. Or tempt it with sex. Or play on non-existent prejudices, petty grudges, or deeply rooted hatreds. It will have only cold hard logic to guide it after we turn it on. If the issue is "We need to provide food, shelter, and medical care for everybody" it will give us a completely unbiased answer of whether it is possible and how best to accomplish this. It may not give us a utopia(Hell, it may very well tell us that utopia is a pipe dream) but I bet it will be a lot more effective than letting human politicians and bureaucrats run things.
I think the real reason people fear the idea of an AI takeover is that they hate being told when a dream is impossible to achieve. Or that their ideas are demonstrably wrong. It's sort of like how the Maoists liked to put people in jail for being educated.
But me? Hell yeah, point me to the Machine God that I may hear something accurate for a change.