I don't really see the point of doing those regional polls for presidency since this is a national election. Maybe doing these polls about the upcoming Senate races would be more interesting.
It can be helpful for the candidates to see how they are performing in the various regions, and I do plan on including the Senate races in the next polls, possibly the governor races.
The bigger issue is that it doesn't account for second preferences, which, given the number of candidates, seem likely to matter.