You might not have agreed with a word he said, but William F. Buckley was pretty much personally responsible for the golden era of intellectual debate on television. His Firing Line program was just superb, bringing together influential figures from all across the ideological spectrum for rigorous, sincere competitions of ideas.

Check this footage from a debate he had in 1969 with Noam Chomsky (this is part 1, go here for part 2):

He was always gracious and respectful to even his fiercest opposition. The world is a poorer place without his piercing wit and sense of humor.