For the record, I would vote 70% Bush, 30% Obama.
The Dems have controlled both houses of Congress for 2 and a half years.
I don't see how Obama has any blame. Instead, I'd put 50% of the blame on those involved in sub-prime mortgages (including the pols who set the scam up)...and 50% on Bush since the problem imploded on the 8th year of his watch and since his administration took away some of the regulations that would have helped limit the damage.
No one should be able to take out a loan if the monthly payment increases their debt to income ratio to over 40%.
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But, if Obama keeps using the excuse, "Hey, my brain's born-on-date is 20Jan2009!" then he is simply wasting space.