A few broad distinctions have defined the United States' two main parties for decades. Republicans advocate smaller government, less taxation, and less regulation. According to the Pew Research Center, their supporters tend to be whiter, older, and more likely to identify as Christian than the average American. Democrats see the potential to alleviate certain perceived social ills through regulation and legislation, funded by taxation. They rely more on young people and ethnic and religious minorities for support. This familiar conservative-liberal political axis has been augmented in recent years by a second axis, which contrasts establishment and anti-establishment agendas. Anti-establishment groups...