Which administration and Fed Reserve policies are causing a stock market bubble?

The stock market has been on a tear since March 23. On March 23, the DJIA was at 18,592 and the NASDAQ was at 6,861. The peak was reached on Sep 2. At that time, the DOW was at 29,100 and the NASDAQ was at 12,056. Since then, the market has retreated. The DOW is currently trading at about 27,800 and the NASDAQ at about 10,800. The unemployment rate peaked in April (March numbers) at 14,3% and has since been trending down. The latest number (for August) is 8.2%. Some of the economic improvement can be traced to government and Fed actions. Do you think those short-term actions have created a bubble similar to the sub-prime crisis in 2007? Do you think the bubble is likely to burst soon?