Too bad this isn't tennis. If I recall, it turned out that Justice Roberts also was not a member of the Federalist Society. Guess you'd like him impeached right away before he does any damage.
But he also didn't reject membership in that organization outright.
Harriet Miers has spoken to them in the past, but that proves absolutely nothing.
The same can be said of ACLU nimrod Nadine Strossen, but I doubt many of the Miers supporters would have been elated at her nomination to the Supreme Court.