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For a second night on Wednesday, thousands of protesters gathered in cities across the state to denounce the idea of a Donald J. Trump-led America, with some chanting, ”Not my president!”

On social media, the hashtag #Calexit took off, echoing the British decision to leave the European Union.

And in Sacramento, a joint statement from legislative leaders said, “Today, we woke up feeling like strangers in a foreign land.”

For one group, the postelection reaction has been electrifying. Yes California, a grass-roots organization with 3,000 or so supporters, has for years been trying to persuade Californians to take up the cause of secession.