Charles Calomiris and Peter Wallison blame Fannie Mae for the Subprime Mess

Hmmmm. The loan performance on Fannie's book of business is substantially better than the overall mortgage market. And starting in 2002, Fannie Freddie (pink line) lost market share to ABS (light blue line). The data underlying the graph is from the Federal Reserve,

Table 1173. Mortgage Debt Outstanding by Type of Property and Holder.