By Trevor Hunnicutt JOLIET, Ill. (Reuters) -Comments by President Joe Biden about shutting coal-powered energy plants days before critical midterm elections drew fire on Saturday from a key conservative Senate Democrat. “No one is building new coal plants because they can’t rely on it, even if they have all the coal guaranteed for the rest of their existence of the plant,” Biden said on Friday at an event touting his administration’s economic policies in Carlsbad, California. “We’re going to be shutting these plants down all across America and having wind and solar.” The remark cast light on a…