How can one judge on the SCOTUS overturn anything???
By being the swing vote, the straw that broke the ruling's back. Kennedy, whom he's replacing, was considered the exact center of the court, and was in the majority probably more often than anyone else. Now, that will probably become Roberts, who is probably more conservative then Kennedy, but apparently vulnerable to coercion. He should take this opportunity to retire and get replaced with a less vulnerable CJ.