In my line of work, Canadian public service, we have to be mindful of colors we use in our promotional graphics. We have to make sure they are non-partisan, meaning that they don't look like they are affiliated with a political party. That means that for all of the 5 following colors, we have to be careful to not use them too predominantly: ❤️💙💚🧡🩵 Seeing purple as the most popular color here, it's surprising that you don't see political parties with purple as their primary color. Why not? Is there a political party using purple as their main color where you live?