My take is that it's bad for democrats... they aren't energized about sKerry. Imagine waiting in line for several hours (if turnout is as high as anticipated by the MSM) in the rain and cold to vote for someone you aren't that passionate about.
On the other hand, the republican base is generally more passionate about our candidate. That combined with a strong GOTV effort should work in our favor.
I'm thinking that shards of glass and rain are good for glass crawling Ohio Republicans.