The Democratic Party primaries have demonstrated two aspects of the progressive drift toward extremist candidates: the character of the candidates themselves and the speed of the transformation of the party. Both of those elements are once again on display with yet another troubling congressional candidate. June 23 is the date of what the New York Times calls “arguably the fiercest primary battle in New York City this cycle,” between five-term incumbent Rep. Adriano Espaillat and Darializa