Lonnie G. Bunch III is enamored of American history. Last June he was named Secretary of the Smithsonian Institution, which he calls "part of the glue that holds the country together." Bunch, who oversaw the creation of the National Museum of African-American History and Culture, is in charge of 19 museums, 21 libraries, the National Zoo, 7,000 employees, and a budget of $1.5 billion — and is on a mission that he believes is nothing short of monumental. He talks with CBS News national correspondent Chip Reid about the personal connections he has to some of most precious objects in the Smithsonian's collections.