Are they only polling people who have yet to vote? If that's the case it would make sense if Trump led in most battleground states like this.
With early voting going on, I've actually been wondering this myself for awhile, since it tends to skew D more often than not.
Angle was up by 3. She lost be 5.
Heller was up by 6. He won by 1.
Romney was down by 4. He lost by 7.
Clinton is down by 2-3. I looks like she will be in the -1 to 6 range. She should probably win and if she loses, it will probably because of one distinct demo spamming the polls.