Survey results in the aggregate can conceal substantial variability among subgroups; it’s therefore wise for assessments of accuracy to include analysis of disaggregated as well as aggregated data. Daniel M. Merkle, executive director of elections at ABC News, presented just such an analysis at the annual meeting of the American Association for Public Opinion Research, comparing group-level results of our final 2014 pre-election ABC News/Washington Post poll with results of the national exit poll on Election Day. (Exit poll results are weighted to the actual vote totals; pre-election polls, of course, are not.) See his findings here.