Unidentified press conference, 1968
Featured in Pat Paulsen for President (1968), part 2 of 6 http://www.youtube.com/watch?v=KbP0ufyax5A&feature=relmfu, 07:20 ff (16:20 ff in full program)
Note: Despite the similarity, this would appear not to be a parody of Vice President Spiro Agnew's "nattering nabobs of negativism", which is from a September 11, 1970 speech.
Context: Many political experts have told me that nobody will vote for me because America is not ready for such decisive and dynamic leadership. They tell me these things, and I say nay to the negative nincompoops who never nourished the nihilistic nerve to name a novice to nail down the nomination.