It makes good television, newspaper pages, etc., to show a map with states colored red or blue, which may be one reason why we haven't ditched the electoral college. Some maps color states purple or yellow or other colors, but the same observations motivate those color schemes as well.
What we are seeing now is that the GOP has blundered so badly that even some formerly-conservative areas, like Montana, are supporting Democrats: those Democrats would not represent San Francisco well though; the Republicans are simply a label that those politicians cannot adopt.
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