I was pulled over tonight for no license plate light. got a ticket for no proof of insurance, i switched companies, fight it?

I just purchased a houes with my fiance, we switched all of our insure from progressive to country. I got pulled over for "No license plate light" around 1:30 A.M. (DUI check of course) My fiance had my old insurance card (for proof for the new insurance company) and my temp card in her car. He wrote me a citation for the insurance but dropped the light. I would love to contest this being that i have a new model car with a loan out on it (state law for IL, must have insurance on a car with a loan) Do you think i could get this totally dropped seeing as i wasn't drunk, endangering anyone, and that I am also an insured motorist? Also i would like to state that Police are to serve and protect....did they serve me? Also, who did they protect?