Instead, it has become an example of disarray and discord, one that rewards extremism, challenges norms and threatens to divide a polarized country even further. “More than anything, we need to change the poisonous atmosphere in Washington,” Mr. Biden said. And that certainly was not the message of his putative rival, Mr. Trump. But the Republicans have been building to this moment since before Mr. Trump won the presidency. In an email on Wednesday, Mr. Gates wrote, “The events of the last couple of days have only underscored how real is the dysfunction.”The post To the World, McCarthy’s Exit Is Just Another Example of U.S.