That was sarcasm, by the way, parodying Obama's pure Saul Alinsky.
An ideology that Obama is marinated in, and used to teach to activists as a community organizer.
And before Alinsky said it, these guys also expressed the same tactic of political slander, harassment and intimidation:
Members and front organizations must continually embarass, discredit and degrade our critics. When obstructionists become too irritating, label them as fascist, or Nazi or anti-Semitic... the association will, after enough repetition, become "fact" in the public mind.
--Moscow Central Committee, 1943
Again: it's not a mystery where the Left developed their ideology and tactics.