It looks like a large amount of Barack Obama's background has been manufactured. Why?

A few weeks later the law school got a phone call from the Board of Trustees telling them to find him an office, put him on the payroll, and give him a class to teach. The Board told him he didn't have to be a member of the faculty, but they needed to give him a temporary position. He was never a professor and was hardly an adjunct.
BREAKING DEVELOPMENT--just as these disturbing facts come to light about Barack Obama, the White House is busy making deals with numerous 'journalists,' promising unprecedented access to the President in exchange for refraining from reporting certain information 'they may discover.'
Investigation reveals numerous bogus claims on Obama resume