exit poll

1.

a survey poll taken by interviewing voters as they leave (exit) the polling place, to determine how they voted and for what reasons; - it is usually taken by news media to learn at an early time (often before the balloting has finished) who the winners are, and sometimes the reasons for the voters' choices.

Noun

1.

exit poll - a poll of voters as they leave the voting place; usually taken by news media in order to predict the outcome of an election

canvass, opinion poll, poll, public opinion poll