voters to assess. JFK's performance in making statements of policy and answering questions was superior to Nixon's. To suggest that 'Tricky Dick's' sweating in the first debate was "Everything" that mattered to viewers is a bit of a stretch...
btw, be sure to watch the entirety of that first debate in the linked Wiki review.
Link: https://en.wikipedia.org/wiki/1960_United_States_presidential_debates