Wisconsin politician is endorsing a book by a discredited doctor promoting an unproven and dangerous treatment for autism and a host of ailments: chlorine dioxide, a chemical used for disinfecting and bleaching.
NEW: Sen. Ron Johnson has a history of spreading vaccine misinformation.
Now he's giving credence to assertions about the therapeutic powers of chlorine dioxide, a disinfectant and deodorizer.
"It is all lunacy," one expert said.
