Crowdpac, a nonpartisan firm dedicated to political data analysis, used federal campaign-contribution records dating to 1980 to estimate where various officials and donors fall on the political spectrum. It scored individual donors as being more liberal or conservative based on which candidates they gave to. Crowdpac CEO and cofounder Steve Hilton told Business Insider this donation data "is the heart of the Crowdpac data model" because its "research shows that campaign contributions are the best predictor of how a candidate will behave in office." Hilton explained that Crowdpac's main goal is to provide people "good objective, nonpartisan information about the...