It’s hard to exaggerate how shocking it is that Scott Walker is out of the 2016 race on September 21.

On April 1, he led the field with 17 percent in the RealClearPolitics polling average. On August 1, he was in second place, behind Donald Trump, with 13 percent. And in the seven weeks since then, his support has collapsed to the point where he is in tenth place, with 1.8 percent—putting him just above Rick Perry, who has 1.0 percent support despite having dropped out ten days ago. The last three polls have Walker at 0, 2, and 2 percent support.