Jobs and the economy never go out style, politically.
The problem for liberal democrats is they want to talk about climate change, free stuff, getting men to piss in the women's room and etc absurdities, instead of putting people back to work. Or when they do talk about putting them to work, they're forced to square the circle of advocating higher taxes to pay for their social programs; or in the case of climate change, advocating energy policy that hits the working class in their pocket books.
That formula just doesn't work outside of the blue precincts. It isn't rocket science.