Wondering how Kerry can be ahead in MN by 9 (LVs, Star Tribune poll), but also behind by 1 or 2 (RVs and LVs, Gallup/CNN and Minnesota Public Radio)? Here's an explanation which doesn't require conspiracy theory: a poll expert pointed this out on Minnesota Public Radio this morning, so I looked, and it checked out.
The Star-Tribune conducted its poll from Sept 7-14. Both Gallup/CNN/USAT and MPR conducted their polls from Sept 11-14, which means that Gallup and CNN both got half their sample on a weekend, and one-quarter of it on Sept. 11, a day when Rasmussen's daily tracker showed a big but transient shift to Bush.
That doesn't mean MN's in the bag: if the results were reversed we'd be crowing about how the Strib poll just caught the end of the RNC bounce, and the other two polls looked more accurate. Bush has been spending time and resources in the state, and he's been on the air a lot more here than Kerry: Kerry may really have slipped a few points over a week. But Kerry may really be ahead by a few points after all this: I hope to ignore the next polls, and I plan to work hard.
(I'm creating a new diary on this because the last diary on MN polls didn't get to it, and has dropped off most people's screens.)