House Democrats left reeling after shock defections

House Democrats were left stunned and pointing fingers Tuesday after a pair of centrist lawmakers unexpectedly helped Republican leadership pass a key procedural vote. Why it matters: The result underscored how little control House Democratic leadership enjoys over some of its more independent-minded members even at crucial moments. The two centrists, Reps. Jared Golden (D-Maine) and Marie Gluesenkamp Perez (D-Wash.), are known to rarely attend party caucus meetings or heed leadership's…