Though there has been plenty of partisan bickering during this week's confirmation hearing for Supreme Court nominee Elena Kagan, there is at least one issue raising concerns on both sides of the aisle. There are questions about how many cases Kagan would have to sit out if she's confirmed, and just how willing she would be to do that. As Solicitor General, the government's top lawyer before the high court, Kagan has been involved with a number of cases that will show up during the Supreme Court's fall term. On Tuesday she testified, "I think that there are probably about...