What is the definition of Nationally Fluid?

"A nationally fluid concept is like a political party with a personality that shifts with the weather, but instead of rain or sunshine, it changes colors based on who's in charge at the moment. Imagine a party where the candidate's stance on immigration is as unpredictable as a chameleon trying to blend into a pack of penguins."

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Now, here's an edgy example sentence: "The nation's mood on social media is nationally fluid, so much so that a single viral dance video can flip the country from optimistic to apathetic in a heartbeat, leaving politicians scrambling to keep up with the ever-changing tides of public sentiment."