High Quality Content by WIKIPEDIA articles! The 2005 Cadillac DTS Presidential State Car was the official state car used by President George W. Bush of the United States during his administration. Analogous to the President`s use of an airplane designated Air Force One, the automobile—traditionally a limousine—is informally known as "Cadillac One". The limousine model was replaced on January 20, 2009, upon the inauguration of President Barack Obama, although both models are still in use.