Just recently Ginsberg was asked to recuse herself from an ACLU case because she was/is an active member in that group. She didn't recuse. I think there is wiggle room for judges in recusal from cases.
ping
There definitely is. The wiggle room only shrinks to almost nothing when the case in question is one on which the judge gave advice as a government attorney; recusal is close to mandatory there. If the case simply involves an organization the judge was a member of, then it's much more within the judge's discretion. The problem with Miers is that she may have directly given advice to President Bush on the policy being disputed in a number of cases that come before her.