Justice Elena Kagan, laughing | Doug Mills/Getty Images Wow, that was quick. At 10:03 am ET, according to the Supreme Court’s docket, a group of Republican plaintiffs filed a brief asking the Court to bless a GOP gerrymander in Missouri. Less than half an hour later, the Court issued a brief order telling these Republicans no — a rare scolding from this Court for the Republican Party, and a rejection of the party’s latest effort to skew elections in its favor. The decision is notable for this Court, but it isn’t particularly surprising. Earlier this week, Justice Brett Kavanaugh deni...