The most "universally impactful" televised events.

But it's based on a survey, so here are some things that people think were more powerful than the Kennedy assassination:

3. O.J. Simpson verdict (1995)...
6. O.J. Simpson white Bronco chase (1994)...
9. BP oil spill (2010)
10. Princess Diana's funeral (1997)
11. Death of Whitney Houston (2012)...
13. Barack Obama's acceptance speech (2008)
14. The Royal Wedding (2011)

The Kennedy funeral is a separate TV presentation, comng in at #20, right after the Casey Anthony verdict.

ADDED: The shooting of Lee Harvey Oswald, live on TV, was a separate event, not on the list at all.