It's also important to realize that both sides were running as a "slate" of candidates. Here is that definition in Wikipedia:
A slate is a group of candidates that run in multi-seat or multi-position elections on a common platform.The three that won were not the only ones that ran together on a slate; it's important to remember that:
The common platform may be because the candidates are all members of a political party, have the same or similar policies, or some other reason.
For those concerned about the environment and contributing plastics to the waste stream, you might be interested in these ideas for recycling these Coroplast signs. It was the Anarchist's use of #5 eco-unfriendly, plastic signs that raised more than a few eyebrow's within the environmental community: