Sentence:  Ralph Wiggum is generally employed as a bottomless fount of glorious <WSD>non sequiturs</WSD>, but in “I Love Lisa” he stands in for every oblivious chump who ever deluded himself into thinking that with persistence, determination, and a pure heart he can win the girl of his dreams. 
Meaning of the word marked with <WSD> tags:  A statement that does not logically follow a statement that came before it.