Recently I was having a conversation with a long time and very liberal acquaintance. We were discussing his difficulty, indeed the near impossibility, of maintaining positive relationships with conservative/Republican/Walker supporters. After it was essentially established that he now socializes entirely with liberals, he noted that he has had multiple conversations comparing our current divisive political climate with the Civil War.
When all your friends agree that a policy that raises the meager public employee contributions towards their health insurance and pensions is like a fight over slavery, well.... I can't think of a better argument for broadening your circle of friends.
In one sense he is right. A civil war will start brewing with uncivil behavior.