Why has the political class demonized the working class?

[Albus Dumbledore]

I'd say it's the reverse. The interests, culture and ideals of heartland suburban/trailor park white protestants have been elevated by both parties for decades. Look at all the Republican fundamentalist moves plus the democrats trying to appease the far right white working class by moving ever right on social/foreign policy issues.

[Albus Dumbledore]

America will vote for center-leftists but not leftists. The mistake the democrats make is running leftists and trying to govern as a left party.

[Albus Dumbledore]

They are required to do so by those they actually represent, who live from sucking the life-blood of said working-class.  And who fear them ever getting a little revenge.

Why do you confuse the US with Tsarist Russia?

[Albus Dumbledore]

'Cause the poors don't give them money.

This. Finance Capital/the moneyed classes hold all the power in this current phase of the west's history. However, things change...