The daily Reuters/Ipsos tracking poll for yesterday found Clinton the choice os 39.7% of those polled, while Trump was the choice of 39.1%. That is effectively tied.
On the other hand, the RealClearPolitics average of leading polls still has Clinton at 42.2% vs. Trump at 37.9%. That's still very close but likely not within the margin of error.
I know which one I'd rather believe; perhaps it is a harbinger.