This article examines the effect of primary season presidential debate
s on voters' attitudes toward presidential candidates. Employing a pre
test-posttest quasi-experimental design, we examine the 1996 Arizona R
epublican primary debate. We find that the debate led respondents to c
hange their viability and electability assessments of the candidates a
nd produced significant changes in respondents' vote preferences. In a
ddition, we demonstrate that changes in viability, changes: in electab
ility, as well as differences between expected and actual debate perfo
rmance influenced the vote preferences of audience members. We conclud
e by speculating about the debate's effect on the Arizona Republican p
rimary, and by noting the potentially important differences between th
e impact of general election and primary debates.