The best way to tell if a poll is valid is to look at the crosstabs. UPI doesn’t publish their crosstabs. Hmmm...
Reuters is crap, too, but at least they have a modicum of integrity and publish their crosstabs so you can see exactly what kind of crap they are. For instance, Reuters is hugely oversampling women. Women are 52 percent of the electorate, Reuters has them at 60 percent. Even with that, Hillary is only up 6. She’s in trouble.