Nader 7? With that we can tell that they have a bad likely voter screen.
3rd party usually polls high anyway early on. Check out Fox/OD from 2000 (I'm not a huge fan of Fox/OD, but aside from my opinion, they have a good reputation... that's why I'm referring to them)...
At this time of year in 2000 Fox/OD only had Nader at 3%, but only a few weeks later (by late June... after he declared?) he polled 7%. He then went up to 8% in July. And while these were RV polls, the issue doesn't appear to be RV versus LV, just people willing to give the 3rd party a look until they realize their vote is important in the two way race. Why do I think this? Well, by late July Fox/OD did a Likely Voter poll and Nader's numbers only dropped to 6%. Then, by September, October, and November, they ran between 3% and 5%... averaging just under 4%.
Gallup was similar, peaking Nader at 6% in a LV poll in June. Tarrance/Snell, oddly, had him much lower at the same time... still he peaked in their LV poll at 6% too, by early August.
Point is, 7% for Nader in a RV poll is not out of whack. Even 7% in a LV poll in June/July/August is only slightly high. If he's still at 7% come September/October, then it's time to ask some serious questions.