Jennifer I'd just use any kit that had your main colours in it. Red/Blue for the main parties, or you could go orange for the poll day colours. I wouldn't worry about themed elements. Just find a kit with nice papers, or even just stick with the solids. New Zealand politics is not likely to match any american kit elements anyway.
Although saying that, if you're a Greens Party voter, KCB's
Go Green kit would be perfect.