Solicitors General

I wonder if the oral argument in the Court's campaign finance case set some kind of record for most current and former Solicitors General presenting oral argument. The current SG, Ted Olson, argued in favor of the law, as did Seth Waxman, a former SG from the Clinton years. Ken Starr, another former SG under Bush I, argued against the law. I find it hard to imagine that there could have been another case where 4 or more SGs argued. Anyone know the answer?