I am also of the opinion that polls matter very little at this point, however if you not the quote on "the canary in the coal mine" from a Democrat strategist in the link below, it would indicate a little concern...

"Democrats are seeing warning signs after a new poll showed Hillary Clinton losing three swing states and deep in negative territory on questions of character.

One Democratic strategist who spoke on condition of anonymity described the poll results as “the canary in the coal mine.”

Dem fears over Clinton

Aside from the polls, these are the kind of headlines to watch for...

"
WASHINGTON — Two inspectors general have asked the Justice Department to open a criminal investigation into whether sensitive government information was mishandled in connection with the personal email account Hillary Rodham Clinton used as secretary of state, senior government officials said Thursday.

The request follows an assessment in a June 29 memo by the inspectors general for the State Department and the intelligence agencies that Mrs. Clinton's private account contained "hundreds of potentially classified emails." The memo was written to Patrick F. Kennedy, the under secretary of state for management.

http://www.cnbc.com/2015/07/23/crimi...-of-email.html

These requests are not from Republican operatives or even Republicans at all. They are from the current State Department.

And as always with anything Clinton, we have this.....

"New York Times alters Clinton email story"

New York Times alters Clinton email story - POLITICO

Still early for both parties but you look for little signs.