Thank them for their past service to the cause and move on.
Yep.
One had, until he discovered he could get some attention by bad mouthing Coulter. And he has been quite useful in bringing her much free publicity!
The leftists are hoping they can sway more people like you to start ignoring Coulter. No prob, those that "get" Coulter will not ignore her, but instead continue to appreciate her timely acerbic political commentary.
And she will continue to have a strong conservative influence on the political climate.