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Now Playing: 1-18-13 Marketplace Morning Report

After years of aggressively denying he had used performance enhancing drugs, disgraced cyclist Lance Armstrong confessed to Oprah Winfrey in a televised interview Thursday night that he was indeed guilty of doping for years. The ordeal has been a disaster for Armstrong -- but for Winfrey's struggling OWN cable network, it's a different story. The Greek Parliament is launching a criminal investigation into the country's former finance minister, George Papaconstantinou. He's been accused of tampering with a list of suspected tax evaders. And, mayors from cities all over the U.S. are meeting in Washington this week. One big item on their agenda is gun violence, as mayors have become one of the biggest lobbying forces in favor of new gun laws.