This Reuters/Ipsos Poll was done between July 25th and 29th of a random national sample of 1,788 registered voters, and has a margin of error of about 2.6 points. It shows Hillary Clinton with a small lead over Donald Trump (barely exceeding the margin of error).
But we must remember that the poll was taken after the GOP convention (which produced a small bounce for Trump) and during the Democratic convention (so probably doesn't include the bounce Clinton will probably get from the convention). It will be interesting to see what the polls show a week or two from now.
