Rove let the cat out of the bag: it's Michigan, stupid:

While all eyes were locked on Pennsylvania for the last six weeks, Clinton was quietly amassing delegates in the Wolverine State. And she was rewarded this past weekend with a significant victory at the district conventions...

Buoyed by party elder support, Clinton seems likely to capture more than 60 percent of the state's 128 pledged delegates, according to an analysis by the Michigan Information & Research Service. Including the 28 superdelegates, which lean heavily in the New York senator's favor, she could win upward of 70 percent of delegates, provided that they're seated with full voting power...

It's becoming apparent that Obama should have consented to a revote here. He certainly wouldn't have lost by 15 percentage points or more; polls have pegged the pair in a dead heat. But Obama seemed spooked that Clintonites put forth the plan and the money, so he quashed the do-over last month.

Now Obama is paying the price in delegates, starting with the Michigan Democratic Party's 15 district conventions on Saturday. The Clinton battle plan was flawlessly executed with an eye toward a contested convention. Their delegate roster is crammed with big names like former Gov. Jim Blanchard and Lansing Mayor Virg Bernero.