When non-rich vote for the right-wing, they are "turkeys voting for Christmas" (or, in the US, for Thanksgiving, which is when we tend to eat turkeys in the US).

The article also shows , almost without intending to, a crucial part of why they do this: right-wingers in control of the state have done them harm over and over, and taught them to blame this on the state rather than on right-wing government. Thus they give up on the only avenue that they could use to stop this.

It's not the only reason many poor people didn't support the Labour Party. The article is right that it didn't try to offer them much.