What a Difference 2 Percentage Points Make
fivethirtyeight.com
fivethirtyeight.com
Now, the difference was in the margin ...
[1] http://projects.fivethirtyeight.com/2016-election-forecast/
A lot of people seem to have read 70% as "no worries", which is simply wishful thinking, and now are blaming Nate Silver for being "wrong".
If your doctor told you you have a 70% chance of surviving the week, you probably wouldn't call that a "sure thing".