Dear Dr. Colleague,
Thank you for running for office in our little area of the Hamster Fur Research Society of America. The Technical Properties of Baskets Group could have really benefitted from your leadership.
However, I have noticed that for the last 3 years that you have been in the group leadership track, you have managed to miss out on every opportunity to do actual work. You know, the Group annual report to the society that you had all the other officers write for you. The last 3 years of planning meetings for which you seemed to always have a last-minute excuse and need someone to cover for you. And this year, when you announced you weren't going to make it, yet again, so could I just "fill in" for you.
I know you are looking for a career move, and that leadership in the society looks good on your resumé. But you can be sure that whenever anyone mentions you this year, I'll give them a sweet, blank look. "Dr. Colleague? I don't know that much about him. I never got to see him that much."