Again, who said a SINGLE data point is a trend? Also, you again IGNORED the MARGIN of victory which I tried carefully to explain. Ugh, the Kentucky seat went to the Democrat by 37+ points, you are conveniently ignoring that fact. Margins matter. Plus you are ignoring ALL the other previous results posted in this thread, 37+ seats have been flipped and is a sign of things to come.
So lets take a look at the Kentucky race... for many years now the state seat in the district was won by a margin of +30 points Democratic or greater. In 2016 the state seat was won by 150 votes in a close race which was +1 Republican (50.4-49.6). Belcher won this special election race by (68-32). Yet the media is focused that Trump won the district by 49 points in 2016 (ignoring the state seat race was merely +1 Republican) The Democratic press focuses on a +45 point improvement compared to Trump /Hillary. Yet they ignore that the Belcher race results actually trail her previous results in the district and the results of the previous state seat results in the district won by Democrats. Yes -- Margins Matter -- you have to compare similar margins in races for the same government position. For example, Obama won many counties in North Carolina in 2008 which also elected Republican state legislators by significant margins. Last night, Democrats flipped a Kentucky state legislature seat in a district Trump won by 49 points Democrat Linda Belcher regains her old seat. https://www.vox.com/2018/2/20/17034262/kentucky-special-election-linda-belcher
In terms of predicting election trends -- the results of an election seat should be compared to the previous elections for the same seat. Comparing the margins in the state seat race to the results for the Presidential contest have very little meaning. In fact doing so is simply creating an illusive fantasy which is not real. State seat races should be compared to previous races for the same seat to establish a trend. Same with Congressional races.
But they are being compared, a seat that Democrats won by 20 points is now being won back by 37+ points, is that not worth reporting on especially considering there were so many Trump supporters in the very same place.
Actually all the Democratic margins on this seat in previous elections were larger than the current election -- including ones with the same candidate.