Looking at reliable recent polls, you could come away with two contradictory conclusions: Donald Trump is cratering, allowing Hillary Clinton to run away with the presidential race. Or Trump has survived an awful month and is surprisingly competitive.
I'm going presume to tell you what the state of play really is by looking at multiple surveys and extrapolating a bit.
Clinton, though she remains an unpopular candidate, has an advantage of about 7 points, though it's slightly less when third- and fourth-party candidates are included. State surveys that show Trump running almost even in battleground states are exaggerated. More worrisome for Republicans are the internal dynamics of these findings that suggest deep trouble for the presumptive nominee and perhaps the party.
Start with gold standard polls. Any list of best pollsters, from the data guru Nate Silver to political practitioners, would include Ann Selzer, the Bloomberg Politics pollster, Peter Hart and Bill McInturff, who conduct the Wall Street Journal/NBC News poll, and Gary Langer, who does surveys for ABC News/Washington Post survey.