It would be interesting to check out RealClear and see if they have similar maps over the last few months. I'd be interested in seeing if Barone's assessment--which i agree with--that the UK plot has tilted things toward the R's is correct. If true, it looks awfully grim for the Dems. All they can say is that the Republicans win elections through fear, but in a world this scary, I'd turn it around and say Democrats just don't get it--we DO have a lot to fear, their Neville Chamberlainism notwithstanding.
I can tell you that even Charles Cook, the cook report has the 20th as "lean" republican. I suspect that they simply don't undertand these races and with limited staff are making educated guesses but will be proven way wrong.
I think these pundits are either inept or fraudulent.