It sounds like you're asking for a clip or specific piece from episode titled "E Pluribus Wiggum" (original air date: January 6, 2008).
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. the simpsons season 19 dthrip
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): It sounds like you're asking for a clip