Because he's a d**k. (Similar to being a Cruz.)
________________UPDATE_______________
Yes readers, you figured it right. D**k meaning, "duck" for "ducking" town halls based on flimsy false pretenses. What else could have been intended? Dork is a noun, admittedly so. Deck can be a noun or verb but does not make sense in context. Dark is not even a noun. Ryan is not a desk. Dusk is daylight waning. Drok is not even a real word. What else?