Mistrial Declared In Clemens' Perjury Trial

A federal judge in Washington, D.C., declared a mistrial Thursday in the case of Roger Clemens, the legendary pitcher accused of lying to Congress about his use of performance-enhancing drugs. The judge said the prosecution had exposed the jury to evidence that the judge had already ruled inadmissible. Michele Norris talks with NPR's Nina Totenberg about what happened in the courtroom.