Why restrict it to red and blue? There are other parties that people are voting for.
If you’re trying to restrict it only to parties that can actually win… then just leave it as red.
(Yeah, they’re just checkboxes in disguise. But you had a chance to do something a bit more interesting and you blew it.)
In particular, there is the possibility (somewhat remote, but it's certainly within the realms of possibility in a way that it has never been before) that the official opposition will be yellow, not blue.
Actually I created it as a general game that also partially works for the election. I agree I should’ve used all parties colours though.