This week's broadcast, hosted by Jane Pauley, features Chip Reid's look back at the life of Arizona Senator John McCain, who died Saturday after a 13-month battle against brain cancer. Also: James Brown profiles Ken Chenault, who is leaving American Express after 17 years as Chairman and CEO; Scott Simon looks back at the bloody Democratic National Convention in Chicago in 1968; Barry Petersen explores the Montana prairie and the conflict over preserving our disappearing grasslands; Tracy Smith checks out an exhibition featuring images of America culled from the Library of Congress' archives; and Rita Braver talks with music legend Art Garfunkel.