Politics Magazine
The Rasmussen Poll was one of the very few showing Donald Trump with a lead in the presidential race after the GOP convention, but now (after the Democratic convention) even they are showing Hillary Clinton leading. They have Clinton with a four point lead now.
This Rasmussen Poll was done on August 1st and 2nd of a random national sample of 1,000 likely voters, and has a margin of error of 3 points.