Zogby is not a reputable pollster. :) That doesn't mean that he doesn't get it right every so often. (even a blind squirrel finds an acorn now and then)
Anyway, this is either a trend or MOE meandering. Or maybe it's just wrong. I'm going to reserve judgment until I see the new C-D polls, because even though they're new and have no track record, I still trust them more than Zogby.
I assume you noticed their IN-09 poll as well, my comments for MN-06 apply there also.
However in IN-09 Zog had Hill up by a lot more than just 2 points, whatever that means.