TLDR... Nate Silver says close race clinton lose the electoral college.
Nate Silvers 538 said given stated yesterday... that given a 3 or 4 point lead in the polls it looked like Clinton had a 70 percent chance of winning but.... they then discussed what if the race tighten to less than 2 points.... (which it has if you look at today's polls.)
The question is how robust Clinton’s lead would be to a modest error in the polling, or a further tightening of the race. So here’s a second set of simulations, drawn from cases in which Trump or Clinton win the national popular vote by less than 2 percentage points:
see a chart of simulations here
http://fivethirtyeight.com/features/election-update-yes-donald-trump-has-a-path-to-victory/
This isn’t a secure map for Clinton at all. In a race where the popular vote is roughly tied nationally, Colorado and New Hampshire are toss-ups, and Clinton’s chances are only 60 to 65 percent in Wisconsin, Michigan and Pennsylvania. She has quite a gauntlet to run through to hold her firewall, and she
doesn’t have a lot of good backup options. While she could still hold on to Nevada, it doesn’t have enough electoral votes to make up for the loss of Michigan or Pennsylvania. And while she could win North Carolina or Florida if polls hold where they are now, they’d verge on being lost causes if the race shifts by another few points toward Trump.
In fact, Clinton would
probably lose the Electoral College in the event of a very close national popular vote.