NATO is suffering an existential crisis as it tries to figure out how to effectively deal with an aggressive Vladimir Putin in eastern Europe.  The alliance has been meeting the last few days in Poland to discuss the future. But U.S. secretary of state John Kerry had more important things to do.  Kerry left the summit early in order to take his daughter to a performance of the hit Broadway musical Hamilton.  He was seen at the theater on Saturday night while President Obama was still in Poland. The Hill: The State Department on Monday pushed back against allegations that Secretary John Kerryskipped out early from a NATO summit in Poland to catch Lin-Manuel Miranda’s final appearance in the hit Broadway show “Hamilton” this weekend. Kerry did go to the musical sensation with his daughter on Saturday evening, the department confirmed, even as President Obama and other world leaders were finishing up a key security meeting in...(Read Full Post)