Can you stand your neighbors? Increasingly, the answer depends on what their politics are. We are moving away from people who disagree with us, and National Review writer David French says we're headed for a "national divorce." French says, "Americans tend to belong to their political tribe not so much because they love its ideas but rather because they despise their opponents." So we've decided to bring in guests who are close friends and political opposites. How do they maintain friendships?