The viewing, hosted by ISU's American Democracy Project and the Student Government Association took place on campus Monday night.
Organizers say they were shocked so many people showed up, especially since the third debate focused on foreign policy, not the economy.
But people we spoke with said they were curious to know which candidate would come out strong.
With the election just weeks away, they wanted to hear each man's stance on the issues to make the right decision at the polls.
"A lot of times when you get it just from the media it's sound bites, it's cut off, and you don't get the full context of what the candidates are trying to say," said ISU senior Hillary St. John.
ISU has held a public screening for each presidential debate this fall.
Last night's had the largest turn out.