For the past four years, Walker has dominated Wisconsin. His bold agenda shattered the status quo, he shocked the left and united the right, and he couldn’t be beat. Recalled in 2012, challenged in 2014, he kept on fighting and kept on winning.
But having spent much of the year as the solid Iowa frontrunner, Walker suddenly finds his presidential campaign in free fall. Nationally, he’s dropped from first place in April to sixth today, barely ahead of Carly Fiorina. In Iowa, he has fallen to fourth, 20 points behind a surging Donald Trump. Graphs of Walker’s poll trajectory over the last year look like a hat: an upsurge, a long peak, and a steady decline.