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Where are the non-mammon mouthpieces in congress? Your focus feels way too narrow to take a reasonable conclusion from.
How he rails against billionaires with a straight face is a mystery.
There is no discernible difference in behavior between the rightmost capitalist and the loudest American socialist.
Not really a mystery. He wants power. The power to assert his will on others, the power to tell others what they may and may not do.
Even ignoring the fact that owning three houses doesn't make one a billionaire (though I suppose in this market he'd have to at least be a millionaire, but it would depend on how he got the second Vermont house), I'm not sure why you would expect socialists to not welcome a class-traitor from the bourgeoisie? Famously Engels was a nobleman after all.