(while poll workers try to figure out why he's the only one voting): "My cat's breath smells like cat food." And later, when asked who he's voting for: "Ralph Wiggum vote for... the new purple flag. And free juice boxes." If you actually meant "Dthrip" as a character name or a specific quote — that doesn't appear in Season 19. Could you clarify if you meant "The Thrip" or a different episode? I’m happy to find the exact scene you’re thinking of.
It sounds like you're asking for a clip or specific piece from episode titled "E Pluribus Wiggum" (original air date: January 6, 2008). the simpsons season 19 dthrip
That episode features accidentally becoming the deciding voter in a presidential primary after Springfield holds an early election to get fast food franchises to compete for their votes. (while poll workers try to figure out why
If you're looking for a notable moment — here's a from that episode involving "d-thrip" (which I think is meant to be a phonetic misspelling of "The Thrip" — a tiny insect or possibly a mishearing of a gag): Could you clarify if you meant "The Thrip"