Whenever I get into a "discussion" with any of my liberal friends about the company one keeps and how it should affect one's opinion of the person, they always toe the line that it doesn't matter. I then ask them why are they are so adamant about Bush because of the company he has kept with Cheney for the last 10 years. Immediate silence and even walk aways.
If they have kids ask them where they send their kids to school and why
(believe me, liberal yuppies are real choosy about the character of the families their kids associate with)