Paul, as despicable as his purpose might be, is not plagiarizing because he is reviewing the plot from the movie, Gattaca. Paul says at the beginning of his remarks that all these ideas come from the movie, Gattaca. His use of the plot elements are therefore not plagiarism, but fair use. He never pretends that the ideas are his own.
Maddow showed several passages that Paul had lifted from Wikipedia's description of the movie without giving credit to the source. Wikipedia, however, does not copyright its stories. Much of its historical information comes from encyclopedias, like the Ninth Edition of the Encyclopedia Brittanica, that are now in the public domain.
Wikipedia's stated purpose is to
Empower and Engage people around the world to collect and develop educational content and either publish it under a free license or dedicate it to the public domain.Disseminate this content effectively and globally, free of charge.
The contents of Wikipedia are covered by a copyright agreement that allows people freely to
Read and Print our articles and other media free of charge.Share and Reuse our articles and other media under free and open licenses.
When someone gives you permission to share and reuse their work, there cannot be any plagiarism of it.
http://www.dailykos.com/story/2013/10/30/1251901/-Not-plagiarism-Rand-Paul-quotes-Wikipedia