First - this is taken from http://www.tnr.com/blog/plank/109714/nate-silver-the-times%E...
Second (as is clear from source article but, once more): via https://twitter.com/JanetCoats/status/265925450696642561
@fivethirtyeight did not account for 20% of NYT traffic; 20% of visitors to NYT looked at 538. Big difference, my math-challenged friends.