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What if sometime in the early 20th century, the eastern counties of California seceded from the state forming "Inner California" as shown in the map below?

How would this effect American politics? Would Inner California be a Republican or at least a swing state? How would the to Californias vote in all the US Presidential Elections since 1960 (assuming the same exact candidates are in the election than IOTL).

2 Californias.png
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