I'm thinking this might have more to do with the coming troubles than the Democrats (from the latest Fortune Magazine).
Wall Street Journal also ran an article that showed that in the past 100 years, the stock market, on average, did better under Democratic presidents than Republican.
In general, the rule is this: if you're in big industry - vote Republican, as conservatives try to conserve and protect what already is; if you're in fields which haven't matured (research, start ups, etc.) vote Democratic, because they hold back the matured industries when they try to crush the upstarts. Neither view is right - only the balance and flow between the views produces the best America.