If you are a lifelong Republican, announce that you have switched parties. How many of your “friends” would stay your friends? Some undoubtedly would, because your friendship is a true horizontal peer relationship of unconditional admiration and enjoyment of each other’s person. But some of them would not, because you (and they) would learn that the arrangement was contingent on something external to the relationship, such as belonging to the same club, faction, philosophy or religion. As soon as that external link disappears, so does the artificial bond that brings you together. That’s when
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