(Editor’s Note: DCist would like to welcome Chris Kelly to our Sports staff. He will be assisting in our coverage of the Nationals with a weekly column each Monday.) Call ’em “The Comeback Kids”, “The One-Run Wonders”, “The Cardiac Kids”; doesn’t matter. Call ’em whatever you want, but your first place Washington Nationals extended their 10-game winning streak yesterday with yet another 1-run victory (8 out of their last 13 wins have been by 1…