Matthew Duss is a leading figure 0n the American political left. However, the left is fragmented, and so we have to qualify this and say he is an important voice in one part of the left — the “connected” left.
Duss is a foreign policy adviser to the independent Sen. Bernie Sanders. Sanders is allied with the Democratic Party, which gives Duss some access to the foreign policy debate inside that party. This can be considered a good thing. We certainly need as many “connected” progressive voices as we can get.