The stock market roller coaster is continuing unabated, last week's $700 billion bailout notwithstanding. Mid-morning today, the Dow Jones industrial sank more than 400 points, falling below 10,000 for the first time in four years, while the credit markets remained under strain. What's more, the credit concerns that have been plaguing the U.S. now spreading to the European markets, with stability still nowhere in sight.

Look for this to dominate the news and the campaign trail (in addition to Palin accusing Obama of "palling around with terrorists who would target their own country") in the days ahead.