From Wikipedia:
"Controversy broke Biden's candidacy for the U.S. presidency in the 1988 Presidential campaign. He was alleged to have plagiarized a speech from British Labour Party leader Neil Kinnock. After Biden withdrew from the race, it was learned that he had correctly credited Kinnock on other occasions but failed to do so in an Iowa speech that was recorded and distributed to reporters by aides to Michael Dukakis, the eventual nominee. Dukakis fired the senior aide responsible, but the damage had already been done to Biden.
It was also alleged that Biden had plagiarized while in law school 20 years earlier in a first-year legal-writing class. Unaware of appropriate standards for legal briefs at the beginning of his legal training, Biden used a single footnote rather than multiple citations required to cite five pages from a legal article. Both Syracuse University Law School and the Delaware State Bar Association cleared Biden of plagiarism charges."
http://en.wikipedia.org/wiki/Joe_Biden
That ahole tried to run for president in 1988? I had no idea. The idea that he plagiarized from a British MP rings a pretty loud bell though. Nice research.