From NBC News:
Just hours ahead of the first 2016 presidential debate, Hillary Clinton continues to lead Donald Trump by 5 points, 45 percent to 40 percent, unchanged from last week, according to the latest NBC News|SurveyMonkey Weekly Election Tracking Poll.
Libertarian candidate Gary Johnson trails behind with 10 percent support, and Green Party candidate Jill Stein has 3 percent support.
In a two-way match-up without the third-party candidates, Clinton has a 7-point advantage over Trump, 51 percent to 44 percent. The margin is up from 5 points last week among likely voters.
Pundits have posited today that typically the candidate who leads going into the first presidential debate tends to win the election.
Not sure how useful that info is in this topsy-turvy election year, but there you go.