https://www.sciencedaily.com/releases/2018/11/181102105956.htm

"Partisanship is indeed a powerful force in shaping our own attitudes and preferences," says lead researcher Nicole Satherley of the University of Auckland. "Our research shows that the positions taken by political leaders and political parties can have an important impact on peoples' preferences, even on issues that are supposed to reflect personal preferences."

Laboratory-based research has shown the effects that partisan cues can have on political issues, but Satherley and colleagues wanted to investigate the phenomenon in a real-world setting by measuring actual voters' attitudes on real-life issues.