sloganeer

noun

1. Someone who makes and spreads slogans.

   “As a sloganeer too, he overspent his voice shouting slogans during demonstrations and he eventually lost it.”

verb

1. To make and disseminate slogans; often contrasted with substantive debate.

   “At such times, the nuanced and expert advice of what they call the rational center — career professionals, scholars, analysts and others working in government and at universities and think tanks — is sidelined or ignored, while emotional sloganeering is amplified by 24/7 cable news and Internet chatter that prize raucous confrontations between fervent avatars of the right and the left.”