Let's be clear, it is not a "donkey" it is a Jackass. A very appropriate emblem for the party of mental midgets. But I like the authors logic. 
It shows a fat White woman in a New York subway car screaming at a young man in a MAGA cap that he is a racist for supporting President Trump. Then she tries to snatch the cap off his head.
When he leaves at a stop, she chases him onto the platform and falls flat on her face. Undeterred, she gets up and continues the pursuit. Every day brings more examples of liberals’ penchant for violence.

Democrats should ditch the donkey and make a flaming Tesla their new symbol
A video clip highlights the left’s rage and sense of entitlement.It shows a fat White woman in a New York subway car screaming at a young man in a MAGA cap that he is a racist for supporting President Trump. Then she tries to snatch the cap off his head.
When he leaves at a stop, she chases him onto the platform and falls flat on her face. Undeterred, she gets up and continues the pursuit. Every day brings more examples of liberals’ penchant for violence.