First - Rasmussen was the ONLY polster in 2016 to pick Trump, and today they are saying the Republicans will get 46% of the vote tomorrow vs 45% for the democrats ( +1 republicans).
Second - Even Nate Silver has already said he is not confident in the blue wave in a tweet.
This is Nate Silver's problems - he bases his own polls on different things but one main thing is his theory that the best funded races win. BUT, the Dems may have a lot more money in ads this year, including the highest funded democrat running, Beto, who is now behind in all polls 51% for (Cruz) to 45% (Beto). But the money means nothing.
Second - Nate is basing his prediction on the fact that democrats have won more midterms since 1924 than Republicans - BUT, Republicans have won 10 out of 12 of the last midterms since 1998. 10 out of 12 - that is a TREND, my friend. What happened before 1990 has NO BEARING on today - most of the voters he is measuring are long dead - Nate Silver is just a guy who had a good run, but who blew it badly in 2016, and is about to blow it again, I believe and hope.
Remember, most polls are run by the media, who cannot help their own bias. It is so deep they can't even see the bottom, they believe what they see is "fact" not just their own Point Of View. That is the problem with American media - they actually believe most Americans think the same way they do.
I also have not been polled politically for decades. And if I was I would probably lie - why would I want to tell the libs they need to work harder to get out the vote?