I wouldn't believe this poll, nor would I believe any poll coming out of this race. Why? Here's two reasons:
1. It's incredibly difficult to accurately poll in Alaska
2. It's incredibly difficult to poll a well known write-in candidate
Nothing would surprise me in this race. But if any pollster is up to the challenge of polling this race, it's PPP.
Incidentally, when was the last time someone won a Senate race with <40% of the vote?
EDIT: I just quickly looked back through the last 30 years of Senate races to 1980, and didn't find any such cases. I'm too lazy to go back earlier than that. I think the closest case may actually be Coleman vs. Franken 2008, where both candidates were at 42%.
There's a good chance that New York 1970 wins.
Yes, New York 1970 does win.