Almost a quarter of American consumers have had a legitimate claim denied by their health insurer. Now Michael Moore's film "SiCKO" has reignited the debate over universal, single-payer coverage in the United States. Michael Moore joins Leonard today to answer his critics. Also: a look at Williams Syndrome, a rare neurological disorder that's characterized by a lack of social inhibitions. Musician Nick Lowe shares his new album, "At My Age." And we'll talk to a swimmer who raises awareness about polluted rivers by swimming in them.