As Joshua at One Free Korea notes, regionalism still persists in South Korea [source].
Now, if South Korea is ever able to fix this problem, it should export the solution, because is this really so different from the United States?
The source of the above has a bunch of other interesting depictions of the results.
For getting a feel for the population weight of each region, I like this map used by The Marmot's Hole in this informative post (with Park support in red and Moon support in yellow)...
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