The in-person votes are counted first
In the south, there was a blue mirage because the mail-in votes were counted first. In the northern battleground states of Pennsylvania, Wisconsin and Michigan the mail-in votes are going to be counted last.
This is something I wrote about earlier. In some sense, this could be the nightmare scenario because it could leave a window for Trump to prematurely declare victory or to claim shenanigans later.
At the moment, there is some evidence of it with Trump up 50-48% in Wisconsin with 37% of the vote counted. With the same vote share, he's up 54.7-43.5% in Michigan. In Pennsylvania he's up 54.2-44.4% with 32% counted.
All these states are going to take awhile to count. Wisconsin doesn't expect to have a tally until 6 am local time.