Polling the Midwestern battleground

Just when everyone thought the presidential election couldn't get any tighter, it has. Recent polls have put states like Arkansas (once thought safe for Bush) and Hawaii (where Kerry was believed to be a shoo-in) onto the list of swing states. Then there's our little corner of the upper Midwest--Minnesota, Wisconsin and Iowa--which is every bit as close as it has been for most of the election. Most presidential elections with an incumbent candidate tend to be more like landslides than photo finishes. Could this one be the exception?