Washington Post/SurveyMonkey Poll: Clinton 47% Trump 43%

In a head-to-head matchup, the Democratic nominee leads 47% to 43%.
When Libertarian Party nominee Gary Johnson and Green Party nominee Jill Stein are included the margin decreases. In that scenario, Clinton is ahead 41% to 38%. Johnson and Stein received 12% and 4% respectively.
This survey has some red flags. For instance, Texas and Mississippi are described as toss-ups states. These are heavily Republican states that haven’t voted for a Democrat since 1976. Meanwhile, a toss-up state like Iowa is categorized as Lean Republican.
For what it is worth, PA is deemed to be in the Lean Democratic category. Overall, the WaPo/SurveyMonkey polls have Hillary Clinton with 244 electoral votes and Donald Trump with 126. 168 electoral votes are toss-ups. It takes a majority of the 538 available electoral votes, 270, to win the White House.
The Washington Post/SurveyMonkey poll used an online-based sampling method and was conducted from August 9th to September 1st. They surveyed 2,863 registered voters in Pennsylvania. The margin of error was not revealed.