This was actually a tactic raised a few years ago which I reported on in the HuffingtonPost here. That attack was quickly put down by the organized bar and I expect the same will happen this time around.
Meanwhile I will just add a little fuel to the fire by pointing out that several of the big law firms that have or still are representing prisoners at Guantanamo also have partners from the far right wing.... Bush's Attorney General Michael Mukasey comes to mind as an example.... perhaps Mr. Mukasey and others should resign if they think it is improper for members of their firm to be protecting the Constitution in this manner.
And if Attorneys like Mukasey think it is ok for their firms to engage in this work (and certainly they knew when they joined their firms of the probono work that their firm were engaged in) then perhaps they should make a public statement supporting the work of their firms.
Just thinkin out loud........