A review of the responsibilities of Democratic House Caucus Leadership:

Minority Leader. (Nancy Pelosi (D-CA)
The minority leader is the principal leader of the minority caucus. The minority leader is responsible for
-Developing the minority position
-Negotiating with the majority party
-Directing minority caucus activities on the chamber floor
-Leading debate for the minority

Minority Caucus Chair. (Joseph Crowley (D-NY) The minority caucus chair:
-Develops the majority caucus agenda with the principal leaders
-Presides over the majority caucus meetings
-Assists with the development of policy.

Minority Whip. (Steny Hoyer (D-MD) The major responsibilities for the minority whip are to
- assist the minority leader on the floor,
- count votes and
- ensure attendance of minority party members.

Source: http://www.ncsl.org/legislators-staff/legislators/legislative-leaders/roles-and-responsibilities-of-selected-leadership-positions.aspx

Democratic Congressional Campaign Committee Chairman (Ben Ray Luján (D–NM) since 2014)
-leads the official campaign arm of the Democrats in the House of Representatives, the only political committee in the country whose principal mission is to support Democratic House candidates every step of the way to victory.

Source: http://dccc.org/about/

I am seeing only one of these people being held personally responsible for losses in Democratic House elections, and for "not creating enthusiasm for Democratic Candidates," and it's not Representative Ben Ray Luján.

Why is that?