Detroit Mayor Kwame Kilpatrick resigns.
Will this alone lock up Michigan? No. But it is probably the single best thing that could have happened between now and election day to help improve Obama's chances in Michigan. He was already enjoying an increasingly comfortable poll lead in the Wolverine State and Kilpatrick's departure from the scene robs the McCain campaign of their best opportunity to challenge Democrats on the change mantle in the state's biggest Democratic stronghold. Furthermore, ex-McCain chief Mike Murphy offers this excellent breakdown of why even with Palin doing uber-outreach to GOP bastions in MI it likely won't be enough.
In the GOP's favour there is still the state of the Michigan economy and Democratic Governor Jennifer Granholm's low approval rating (although watch for a possible change there now) but in all likelihood: Obama's record-breaking ground game + the departure of Kilpatrick = Michigan secured.