A woman has gotten the attention of the country for texting during the national anthem at the White House Correspondents Dinner. Not only has it been discovered that this woman works at a major news outlet, she offered up an excuse for her behavior: She was just taking notes. The woman turns out to be a Washington Post columnist named Helena Andrews, and she writes for “The Fix.” She offered up an excuse for her behavior on Twitter, and then appears to have thrown in a bit of snark that did not go unnoticed: Her tweet drew a backlash from...