The Dean Dozens refute that argument. DFA endorsed over 100 candidates at all levels of government and contributed to nearly 750 candidates around the country. One-third of those endorsed by DFA won their respective races, including a Democratic governor in Montana, a Democratic mayor in Salt Lake County, Utah, and an African American woman to the bench in Alabama.
Another DFA endorsement was Richard Morrison's race against Tom DeLay, which helped force DeLay to actually spend money and time campaigning in his district.
Dean was not the campaign manager, political direcor, field director, communications director, GOTV manager, or any other position in any of those campaigns. Don't pretend that because you feel strongly he should be the Chair, for very valid and compelling reasons, that his resume automatically includes all of the experiences you feel a Chair needs.
Donnie has been in the field, with the party activists and voters screaming with them that if the DNC understood what was needed to win a race they would provide x, and y, and three times as much z as we got. That experience is priceless.