With only a few exceptions, the references for The Complete Obama Timeline are Web pages. Where information was obtained from magazines, books, or newspapers, Web pages were tracked down that contained or confirmed the same information. The result is that anyone with the desire—and the time and the patience—to check the thousands of references can do so without leaving his or her computer. Unlike books, however, Web addresses and Web pages can be changed or deleted over time. It is therefore impossible to expect all the references appearing below to remain permanently accessible. (Obama supporters have also been known to “scrub” the Internet of Web pages that may be considered damaging to him.) In many cases, multiple sources have been listed in order to compensate for the eventual and unpreventable loss of some Web pages. Hopefully, most of the references will remain valid.