Being a socialist explains why she is anti-voucher, generally. It does not, IMO, fully explain her bizarre rant.
She was trying to show how socialism will defend against racism, and it was pathetic. She is not a logical thinker at all--she merely latches on to an idea that appeals to her sensibilities and then that's as far as she goes, from that point on she just pleads. There she was trying to make taking money away from black people and limiting their choices look like a good thing, like big sister was looking out for them. A revolting woman who flails around grabbing 60's-70's leftyspeak because she doesn't much like people, she's more comfortable with ideas, yet she hasn't the capacity to think clearly and logically.