Why do the same lawyers get to argue Supreme Court cases?

Cases that make it to the Supreme Court are often argued by a relatively tight circle of lawyers who are well-known to the justices, and more likely to share educational backgrounds and private firm pedigrees. Reuters examined 17,000 filed petitions, uncovering an unusually insular world at the nation's top court. Reuters legal editor Joan Biskupic joins Gwen Ifill to discuss the findings.