Who is really running the United States?

With the obvious mental deterioration of President Biden it is widely speculated that the country is being run from behind the scenes by somebody else. Some names being tossed around have been Barack Obama, George Soros, Bill Gates or China's President Xi. It could even be somebody even more sinister than that.

Is this the real power behind the Oval Office?
Is this the real power behind the Oval Office?
Who is really running the United States?
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