Field for Gallup or Roper

• The branch of sociology that studies election trends (as by opinion polls)

Wikipedia Word definitions in Wikipedia
Psephology (from Greek psephos ψῆφος, 'pebble', which the Greeks used as ballots) is a branch of political science which deals with the study and scientific analysis of elections . Psephology uses historical precinct voting data, public opinion polls , ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"study of elections," 1952, from Greek psephizein "to vote" (properly "to vote with pebbles," from psephos "pebble") + -logy .

WordNet Word definitions in WordNet
n. the branch of sociology that studies election trends (as by opinion polls)

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ The fear this must engender day-in, day-out is more important than the minutiae of psephology . ▪ The introduction of psephology encouraged the growth of opinion polls as a guide to voting trends.

Wiktionary Word definitions in Wiktionary
n. The predictive or statistical study of elections. (From 1952)