Now Playing: 3-13-13 Marketplace Tech: Cory Booker, Tech Star?

South By Southwest might be a festival of rock, movie, and technology stars. But Austin, Texas also had a visit from a politician who wants to be a tech star. It's the mayor of Newark, New Jersey, Cory Booker, who was at a hack-a-thon put together by some of Lady Gaga's social media people. Why was Booker in Austin? To launch a start-up, of course.