Xi, Nan, Di Ma, Marcus Liou, Zachary C. Steinert-Threlkeld, Jason Anastasopoulos, and Jungseock Joo. 2020. “Understanding the Political Ideology of Legislators from Social Media Images”. Proceedings of the International AAAI Conference on Web and Social Media 14 (1):726-37. https://ojs.aaai.org/index.php/ICWSM/article/view/7338.