Catherine Rampell: Trump’s narrative is nonsense. So why is the media buying it?

Washington • Yes, Democrats can walk and chew gum at the same time. The problem right now is that all anyone ever asks about is the gum-chewing.President Trump is steadily advancing a narrative that Democrats are unable to focus on a substantive policy agenda because they're too fixated on investigating, subpoenaing and, eventually, impeaching the president.Or, as our victim in chief tweeted on Monday: "The Dems are getting NOTHING done in Congress! They only want a Do-Over on Mueller!"This