After 25 years of dominating daytime TV, nobody needs to hear Oprah's last name. Some advertisers are paying a million dollars for 30-second commercials on tomorrow's last episode of The Oprah Winfrey Show. It's being called the biggest wrap-up in television since Johnny Carson walked away from The Tonight Show. Oprah's launched a lot of products, books and various careers, and even claims some credit for President Obama's election. Robert Thompson, Professor of Popular Culture and Television at Syracuse University, considers her impact on American culture.