One thing you see a lot with the current turmoil, as with any stock market fluctuation of interest, are “reasons” given for whatever fluctuation is happening. At the moment, that means journalistic comments like:
“The rally came amid renewed hope that US politicians will pass a financial rescue package.”
Maybe another “reason” is that fundamentally sound businesses were now on sale at bargain prices, and some people moved in to take advantage of this?
My point is this: both are merely guesses, and essentially meaningless ones at that. They don’t help us understand what’s really going on.