Voters don't want to hear about impersonal things like supply and demand. They want to hear about how their political heroes will stop the villains from "gouging" them or "exploiting" them with high prices.
A politician with good rhetorical skills can create a new Garden of Eden in people's minds, though only in their minds. However, that is sufficient, if that vision or illusion can be kept alive until election day, and its failure to materialize afterwards can be explained away by the obstruction of villains.
One of the many ironies of politics is that those politicians who do the most to reduce supply often express the greatest outrage about high prices.