On the subject of undecided voters, a story in WaPo indicates that Democrats believe there are extremely few undecided voters, meaning this will ultimately be a turnout election:
https://www.washingtonpost.com/blogs...=.670f77882e63
There is some other stuff in there about the VP debate, but honestly that is a bit less interesting. The real point to me is that the Democrats are betting on a turnout strategy that targets the Obama coalition, which is still there but less enthused about voting for Clinton.