It seems neither of you know or possibly care what caused the Great Depression. Grats on that.
In fact here, becuase maybe you're not a typical Obama-bot.
Milton Friedman Debunking Myth Of The Great Depression part 1 - YouTube
That video is all fine and dandy when it comes to bank collapses.
But it doesn't really take an in-depth look as to what caused the massive market failure that preceded the bank collapses.
In fact, it pretty much pooh-poohs the crash and the recession that coincided with it as irrelevant.
The giant bubble and bubble-popping of 1929, was caused by massive over-leveraging, brought on partially by the fact that the capital gains interest rate was 12.5%, much lower than it has ever been at any time in the last century.
In fact, the crisis just past bears a huge amount of resemblance to the bubble-crash of 1929, and the capital gains rate was the lowest it has ever been (15%) with the sole exception of the 1920's.
Lowering the Capital Gains rate reduces tax revenue, encourages bubble formation and over-leveraging, and helps create wealth inequity.
And it does not encourage investment in US jobs, because the companies being invested in are sending the jobs overseas.
Friedman is not the only school of thought on the subject, and there's good reason for that.