"There are plenty of culprits, like lenders who peddled easy credit, consumers who took on mortgages they could not afford and Wall Street chieftains who loaded up on mortgage-backed securities without regard to the risk.
But the story of how the United States got here is partly one of Bush's own making, according to a review of his tenure that included interviews with dozens of current and former administration officials.
From his earliest days in office, Bush paired his belief that Americans do best when they own their own homes with his conviction that markets do best when left alone. Bush pushed hard to expand home ownership, especially among minority groups, an initiative that dovetailed with both his ambition to expand Republican appeal and the business interests of some of his biggest donors. But his housing policies and hands-off approach to regulation encouraged lax lending standards." ...
"Concerned that down payments were a barrier, Bush persuaded Congress to spend as much as $200 million a year to help first-time buyers with down payments and closing costs. And he pushed to allow first-time buyers to qualify for government insured mortgages with no money down. "
http://www.nytimes.com/2008/12/21/business/worldbusiness/21iht-admin.4.18853088.html