Giuliani spoke for 40 minutes, and there were some
rather long intervals with no applause--but also with no whispering
or buzzes: It was eerily quiet, and I got the impression people
were genuinely interested in hearing what Giuliani had to
say.
This is very true. I spent some time yesterday editing audio from
the Giuliani, Romney, and Brownback speeches (my
computer crashed, so the effort was for naught). There was
plenty of background noise during the Brownback and Romney
speeches; on the Giuliani recording, there was almost none.