Scent Used as a Political Weapon?

"Republican Van Tran, the upstart challenger to Rep. Loretta Sanchez (D-Calif.), is betting on voters sniffing out his opponent's struggles -- literally. " Thus begins a small article on the National Journal which describes how the politician is sending out direct mail which targets Sanchez with its scratch-and-sniff which emanates a horrible odour comprised of the combination of some of the