American Tapestry: The Story of the Black, White and Multiracial Ancestors of Michelle Obama

Rachel L. Swarns talks about tracing the first lady's forbears back to the 18th century, the tantalizing hints of Jewish and Native American links in her family line and about using DNA testing to identify her ancestors.

Swarns, who covered Mrs. Obama's first year in the White House, also discusses the 2012 election and how the first lady is one of the president's most popular surrogates on the campaign trail.