Mitt Romney's decisive victory in Arizona on Tuesday won him every one of that state's 29 delegates in what was a winner-take-all election. But it was quite a different story in Michigan.
Even though Rick Santorum finished 3 percentage points behind Romney, Santorum ended up with the same amount of delegates: 15. That's because Michigan awards most of its delegates according to congressional districts.
Every one of the 10 states voting next week on Super Tuesday will also award delegates on a proportional basis.
It's ALL THINGS CONSIDERED from NPR News. I'm Robert Siegel.
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And I'm Audie Cornish. Deadly tornadoes swept through the Midwest overnight and this morning, killing at least eight people. The storm system hammered parts of Nebraska, Kansas, Missouri, Illinois and Kentucky, where it still poses a threat.
As NPR's David Schaper reports, hardest hit is the small city of Harrisburg in southern Illinois.
Federal Reserve Chairman Ben Bernanke acknowledged that the economy is improving on Wednesday, but he isn't convinced the recovery is self-sustaining. He reaffirmed the Fed's position that the economy will likely need super-low interest rates well into 2014.