Which revolutionary retail machine learning technique did Obama's 2012 campaign pioneer that changed how political campaigns target voters?

Modern political campaigns leverage sophisticated retail marketing strategies and machine learning to target voters. These techniques, originally developed for consumer products, have revolutionized how politicians connect with constituents. From micro-targeted social media ads to sentiment analysis of voter responses, political campaigns now operate with the precision of major retail operations. Test your knowledge about this intersection of product marketing techniques and political campaigning.

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Persuasion Scoring - Calculating the statistical likelihood of each voter being persuaded to support a candidate
Demographic Clustering - Grouping voters solely by traditional demographic characteristics like age, income and education
Engagement Prediction - Predicting which voters will watch political debates based on past media consumption
Donation Maximization - Machine learning to identify the optimal donation amount to request from each supporter