When did the parties switch platforms?

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lmao "the parties never switched platforms"

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lmao "the parties never switched platforms"

Go on?

Red - States that voted majority R before 1964 and majority D since 1964
Blue - States that voted majority D before 1964 and majority R since 1964
Green - States that voted majority R both before and after 1964
Orange - States that voted majority D both before and after 1964
Yellow - States that voted for both parties equally before 1964 and majority R since 1964

This seems to imply (correctly) that either the parties or the states switched platforms sometime around 1964.

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lmao "the parties never switched platforms"

They didn't, their bases just changed.

Their bases changed because their platforms changed.