" Since 1990, The Walt Disney Company had lobbied for copyright extension. The legislation delayed the entry into the public domain of the earliest Mickey Mouse cartoons, leading detractors to the nickname "The Mickey Mouse Protection Act".

In addition to Disney, California congresswoman Mary Bono (Sonny Bono's widow and Congressional successor), and the estate of composer George Gershwin supported the act. Mary Bono, speaking on the floor of the United States House of Representatives, said:

    Actually, Sonny wanted the term of copyright protection to last forever. I am informed by staff that such a change would violate the Constitution. ... As you know, there is also [then-MPAA president] Jack Valenti's proposal for term to last forever less one day. Perhaps the Committee may look at that next Congress.

https://en.wikipedia.org/wiki/Copyright_Term_Extension_Act