You can find the leaked document here (via the NYT). He also correctly predicted that the case would come down the votes of CJ Rehnquist and Justice O’Connor (both in the end switched sides from their earrlier positions on this issue).
There’s little question where Judge Kavanaugh stands on campaign finance. He’s likely to vote to strike down even individual contribution limits, and already created a gaping hole in the rules meant to limit foreign money in U.S. elections.