Roberts is no moderate and the voting by Specter and Leahy means nothing after all Scalia had 90+ votes and is certainly no moderate.
Actually, I'm talking about the votes that matter. That is, the ones from the Senate Judiciary Committee. The 96 votes Scalia got were after the committee vote, and the reason they were so high is because the Senate unites to support the committee recomendation. Somewhat of a tradition.