Well, the horror of the situation is that any meanness could cause Manchin to go Republican. You just KNOW that they have been offering him the world and all its riches to switch parties.
Which would mean Moscow Mitch once more controls the entire First Branch of Government. We can’t let that happen.
Manchin is nominally a Dem. That means he has a “better nature” to appeal to. Get his constituents to beg for a Green New Deal. Manchin is apparently in it for the coal mine operators and oil companies, whence comes his money. But he’s in office because his constituents (the “little people”) are the ones who vote. They need to plead for safer, greener jobs and controlling climate change. For the medical care they need, thanks to their coal-mining former jobs. For an end to mountaintop removal and heavy metal poisoning of their streams, where their grandparents used to be able fish.
And it would have the added advantage of being true.