People in Western Europe differ in their attitudes about major political parties and on key policy issues based on their ideology and whether their views are more populist or mainstream. A Pew Research Center study of eight countries’ political dynamics used those factors to categorize survey respondents into six political groups: Left Populists, Left Mainstream, Center Populists, Center Mainstream, Right Populists and Right Mainstream – plus a seventh, Unaffiliated, who identify with no particular ideology.