Wisconsin Gov. Scott Walker surged into the top tier of the Republican presidential race with a fiery speech in the depths of winter in Iowa. But his candidacy has wilted in the heat of a summer dominated by Donald Trump, with loyalists and supporters now calling for an immediate mid-course correction.
Walker’s backers see a campaign discombobulated by Trump’s booming popularity and by his provocative language on immigration, China and other issues. They see in Walker a candidate who — in contrast to the discipline he showed in state races — continues to commit unforced errors, either out of lack of preparation or in an attempt to grab for part of the flamboyant businessman’s following….