In 1991, Obama accepted a two-year position as Visiting Law and Government Fellow at the University of Chicago Law School to work on his first book.[40] He then served as a professor at the University of Chicago Law School for twelve years; as a Lecturer from 1992 to 1996, and as a Senior Lecturer from 1996 to 2004 teaching constitutional law. http://en.wikipedia.org/wiki/Barack_Obama
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(BHO may also have gotten his book advance that year.)
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Also, 1991 speech:
Barack Obama 1991 Speech Found by Keith Olbermann
Keith Olbermann found an interesting little bit of history on his show last night: a newspaper article from a high school that Barack Obama spoke at back in 1991.
What was he talking about?
"Change is Possible"
You can check out the video here.