I'll concede that the outlook...

...for the Democrats' holding the Senate next Tuesday looks bleak. But according to Nate Silver, the Republicans are going to have to sweat a little (my emphasis):

Our model estimates that while Republicans have a 64 percent chance of winning the Senate eventually, there’s only a 27 percent chance they’ll be able to claim their victory within the first 24 hours or so after polls close on Nov 4. Democrats are even less likely to win a quick victory — they have just a 12 percent chance.

The other 60 percent of the time, it will take days or weeks to sort everything out.