On his Countdown show Thursday night, MSNBC's Keith Olbermann delivered his latest attack on conservative commentators Bill O'Reilly and Ann Coulter by indirectly referring to them as "dogs" during a discussion of politicians who write children's books in the name of their pets.

The Countdown host brought aboard comedian Mo Rocca to discuss Senator Ted Kennedy's new children's book, The Senator and Me, about the Senator and his pet dog Splash. Although Olbermann rarely pokes fun at or attacks liberals, while going after conservatives habitually, even he could not resist the irony of the name Splash because of Kennedy's history at Chappaquiddick. But Olbermann couldn't get through the segment without taking a gratuitous shot at his two favorite conservative targets.

Referring to the tendency of politicians to write children's books as if their pets were the authors, Olbermann soon posed the question to Rocca, "How many dogs have written political books, not including Bill O'Reilly and Ann Coulter?"