“[Donald] Trump’s second-place finish to Sen. Ted Cruz (Tex.) in Tuesday’s Wisconsin Republican primary may represent no ordinary setback,” write the Washington Post’s Karen Tumulty, Jose A. DelReal and Robert Costa. “It appears to be a pivot point—although it has yet to be seen whether the trajectory from here points downward or upward.” ~snip~ The last time he faced the prospect of venturing into hostile territory—when his rally in Chicago was overrun by left-wing disruptors—he ended up bugging out. If he fails to secure a majority of delegates, perhaps rather than endure defeat in Cleveland he will find a way...