University of Virginia Center for Politics Director Larry J. Sabato will reveal a major new finding regarding the assassination of President John F. Kennedy Tuesday at 10 a.m. at the Newseum in Washington. The press conference will be webcast live online or optimized for iPhone and iPad here.

The finding calls into question one of the conclusions of a major government report on Kennedy’s assassination. This is not a new theory; rather, Sabato will describe scientific findings about a key piece of evidence that undergirds a government study.

Additionally, Sabato will further discuss the assassination, as well as discuss new information about Kennedy’s enduring impact on his nine successors in the White House. He will also discuss a major new public opinion survey on the American people’s opinions on John F. Kennedy and the Kennedy legacy.

The live webcast will kick off the Center for Politics’ Kennedy Legacy Project, which includes Sabato’s new book; a website; a forthcoming international PBS documentary produced by the Emmy-winning Center for Politics and Community Idea Stations team; a free online course on JFK, beginning Oct. 21 and available through Coursera and iTunes U; and a forthcoming mobile app that will let users re-live the events of Nov. 22, 1963.