Donald Trump requires an opposition to keep him in check, but also gives them plenty of ammunition to work with. So how did they still manage to blow it?The beginning of this year presented Democrats and their sympathizers in the media with both an important job and a big opportunity. Donald Trump governs in a style that somehow manages to combine authoritarian bluster with a total lack of self-discipline. He requires an effective political opposition to keep him in check, which also gives the opposition plenty of ammunition to work with.So how is that the Left spent most of 2017...