Trump’s weakest counties
As Jacob pointed out, Trump is currently winning every single county in Iowa. There are a few counties where he’s notably weaker, though. Johnson County, the home of Iowa City and the University of Iowa, is his worst county: He’s leading Haley only 36 percent to 35 percent there. He’s also leading Haley just 34 percent to 30 percent in Story County, home of Ames and Iowa State University. Sensing a pattern? Trump is doing the worst in Iowa’s most college-educated and bluest counties. These were also the counties that Sen. Marco Rubio did best in in the 2016 caucuses, back when he represented the last great hope of the GOP establishment to stop Trump.
—Nathaniel Rakich, 538