Not long after New York Mayor Bill De Blasio trashed law enforcement in 2014, two NYPD officers were murdered by a man who wanted to put "wings on pigs." The response from the police: thousands of officers literally turned their backs on the mayor at the officers' funeral. So the question is what kind of treatment is President Obama going to get when he arrives in Dallas on Tuesday? If statements from law enforcement — including a leader in a police union that represents 240,000 officers nationwide — is any indication, the president should plan for the worst.Thursday, Obama gave a speech in which he repeated misleading statistics about law enforcement's treatment of minorities and condemned the justice system as being plagued by...