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It's the economy

Some Wall Street analysts say that the Dow's 158.46-point drop yesterday, its worst in more than four months, "was long overdue given the Dow's uninterrupted run-up in recent weeks." 

CNBC's Patti Domm points out that Fed junkies not only get to hear from chair Ben Bernanke today on the nation's economic outlook, but also from former chair Alan Greenspan, who speaks at a separate New York luncheon.  Bernanke could be newsier, but certainly the markets will be listening to what both have to say.  Greenspan will take questions; Bernanke will not.