@cicerone imposter,
Fannie and Freddie were created prior to Bush's elections.
Bush did not cause Fannie and Freddie to make bad, low interest loans.
Fannie and Freddie made bad, low interest loans because it was designed by prior administrations to do that.
Bush failed to convince Congress to correct Fannie and Freddie.
Any program Congress passes can be subsequehtly rescinded if Congress votes for a bill to rescind it and the President signs that bill to rescind it.
If Obama had not signed Stimulus, then no Stimulus funds would have been spent.
If no Stimulus funds had been spent, then Stimulus would not have decreased federal tax revenue and/or increased federal debt.
If federal tax revenue had not been decreased and/or federal debt had not been increased by Stimulus, then the feds would have had more funds to spend on aiding private buying from the private economy.
If the feds would have had more funds to spend on aiding private buying from the private economy, then fewer jobs would have been lost.
If Obama had corrected Bush's errors, then fewer jobs would have been lost.
If fewer jobs had been lost then the depression would have not been as severe.
If the depression had not been as severe, then it could have been only a recession.
If the depression had been reduced to a recession, then the US economy would have sooner again begun increasing total USA employment.