I have no idea why Bret Baier does what Bret Baier does. This is a solidly Republican area that went for Trump in 2016 and should go for Trump in 2020 with the same margins.
And why, if it was a done deal, did Trump feel it was necessary to have a rally in Keller’s district?
Trump is looking to 2020. He needs Pennsylvania and I'd expect him to hold a number of rallies there between now and election day.
Bret Baier is a member of the media and I have no doubt people over at CNN & MSNBC proclaimed this a referendum on Trump as well. This is a typical scenario for them: blow it up as a referendum and then when the results are the opposite of what is predicted, bury the story.
If it was a done deal, I don’t understand why he had to have his rally in Keller’s district. He could have had a rally in one of the more dicey of the 18-19 districts. But he didn’t.