Here's Real Clear Politics's final Senate No Toss Ups 2016 map:
Go here to see the toss-ups tossed back in. There are 8 of them. I'm most interested in my home state, Wisconsin, where there have been very few polls, but the trend lines have been converging.
I've mentally adjusted to what I think will be the outcome today: Hillary wins, but the GOP keeps both houses of Congress. But I can also imagine something surprising happening. There's that idea of the "hidden Trump voters." There don't need to be too many to upset the prediction that Hillary will win, but what a kick in the head it will be if there's a decisive victory for Trump. And a Trump victory with the GOP holding both houses of Congress will make this a shocking change election. I'm picturing the GOP Congress as a brake on the power of the President, not an accelerator.
Here's a NYT article from yesterday: "Are There Really Hidden Trump Voters?" How do you go about answering that question? (Other than waiting for the election results.) The article is by 2 professors — Peter K. Enns and Jonathon P. Schuldt — who teach a public opinion course at Cornell and had students design survey questions that could smoke out hidden Trump supporters. Go to the link and read about the 3 questions why they think the answers showed that there are hidden Trump supporters. (I'd have to copy the whole column to explain the question, the answers, and the interpretation.) The professors also think these hidden Trumpers will not come out and vote.
I guess you could be secretly, at heart, a Trumper, but unwilling to admit it even to yourself. To go to the poll and mark a ballot, you have to at least show yourself what you think. That can be hard to do.