Did Fannie and Freddie really cause the housing bubble? Paul Krugman posted some interesting graphs that suggest the answer is "no." They show the percentage of mortgages securitized by Fannie Mae
This isn't to suggest that Fannie and Freddie were a paradigm of corporate governance, or that they don't badly need reform. But it does raise some questions about the widespread belief that the government-sponsored entities were the primary cause of the housing bubble and that if we just fix them everything will be hunky-dory.