Kate Walsh stops by the Ed Sullivan theater to tape an appearance for The Late Show with David Letterman, showing her support for Pedigrees Dogs Rule! campaign and Democratic candidate Barack Obama (check out the pin on her coat!). On Letterman, Kate, 40, shared a little bit about her newly adopted dog, Flower. The Private Practice star said Flower was a mutt, part-labrador and either part-rottweiler or part-German shepherd. Kate also showed off her new dark and extra-long hair.