Source: https://www.washingtonpost.com/blogs/plum-line/wp/2018/03/21/a-gop-senators-remarkable-admission-about-trump-and-mueller/

“People who tell me, who are out on [the campaign] trail, say, look, people don’t ask about issues anymore. They don’t care about issues. They want to know if you’re with Trump or not,” Corker added.

Here we are. Rabid Trump supporters are still out in large numbers in Trump country. No telling if PA-18 is a harbinger or not (although I sure would like for it to be). He campaigned there to no avail, but was it a fluke?