It's more that their constituents are exposed to a constant stream of propaganda which favors fossil fuels and the destruction they cause.
There is no real left-wing messaging machine that compares and can tell people about the harm they're experiencing or the benefits of renewables.
Even there, Manchin was a major problem. Almost all the Democrats wanted stuff like an expanded child tax credit, but Manchin announced that if parents had money, they'd all go out and buy meth, so he insisted on its removal from the bill before he would vote for it.