That politician is a typical demagogue who gains support by stirring up emotions rather than proposing rational policies.

demagogue 由希腊词根 demos（人民）和 agogos（领导者）组成，字面意思是"民众领袖"。在现代英语中特指"通过煽动民众情绪而非理性辩论来获取支持的政客"，带有贬义色彩。