They're probably a bunch of libs that created a "conservative" name, with the intent of making headlines and undermining the Roberts nomination.
Even if they are "legitimate", who cares?
Considering the current makeup of the Senate I don't believe that any candidate to the right of Roberts could get 51 votes for confirmation. The process is being driven by special interest groups both left and right that demand ideological purity and will settle for nothing less. If Bush nominates a person who is "ideologically pure" then that person is an ideologue and would never be confirmed.