That's an obvious general principle. In particular, though,
The explanation on Spitzer, I suppose, is that when everybody hates you any excuse is good enough. If someone claims to be Mr. Righteous, and he's grossly abusive and people get tired of him, they like to stick it to him. On Jeremiah Wright, all I can say is that discussions relating in any way to race are always grossly irrational. You have to say this and you can't notice that. The Right is anti-science because they have ethical problems with stem cell research but the Left isn't anti-science because they got rid of James Watson for saying something obviously true about Africans. Predicting what's going to be allowed as an issue is like predicting an eddy in a turbulent stream. It just can't be done.