Journalist Barbara Walters, Congressman John Lewis, and comedian Margaret Cho will join scholar Henry Louis Gates, Jr. to trace their family trees. His new PBS series, Finding Your Roots with Henry Louis Gates, Jr. , premiers this weekend. Gates discusses the series with host Michel Martin.
Mitt Romney has an impressive victory in Illinois, gets Jeb Bush's backing, revives the inevitability argument and then gets bogged down in an Etch A Sketch distraction. Plus: Illinois primary results, and Barbara Mikulski breaks a record. NPR's Ken Rudin and Ron Elving have this week's political roundup.