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Being caught taking bribes maybe is the final straw. It does not matter of those bribes are paid through speaking fees or through donations to her charity.
I suppose it would be, but it wouldn't be all that surprising to me if the Clinton Foundation also acted as a sort of slush fund, or cover for bribery. I'm not saying it is, but it wouldn't be so surprising. But even if it were true, I still prefer her over Trump, because he's not even smart enough to get away with it. I'm not so naive that I think even "good" politicians don't use backchannels and secret deals. The question is, do they work, and are the ultimate results beneficial to the people?
I cannot imagine those who have donated the most to the clinton foundation are interesting in benefiting the people. Because they continue to pay the bribes, they must get something in return.