Joe Biden's campaign also ended in controversy after he was accused of plagiarizing a speech by Neil Kinnock, then-leader of the British Labour Party. The Dukakis campaign secretly released a video in which Biden was filmed repeating a Kinnock stump speech with only minor modifications. Biden later called his failure to attribute the quotes an oversight, and in related proceedings the Delaware Supreme Court's Board on Professional Responsibility cleared him of a separate plagiarism charge, leveled for plagiarizing an article during his law school. This ultimately led him to drop out of the race. Dukakis later revealed that his campaign had leaked the tape, and two members of his staff resigned. (Biden later ran twice more for the Democratic nomination, unsuccessfully in 2008 and successfully in 2020. He was elected the 47th vice president in 2008, serving two terms under President Barack Obama. In 2021, he became the 46th president, 33 years after his first campaign for the office.)