Could John McCain have been elected president?

If the supply of mortgage credit had not contracted from 2004 to 2008, McCain would have received half the votes needed in nine crucial swing states to reverse the outcome of the election. The effect on voting in these swing states from local contractions in mortgage credit supply was five times as important as the increase in the unemployment rate; if unemployment had not increased from 2004 to 2008, that improvement in local labor markets would only have given McCain only 9% of the votes needed to win the nine crucial swing states.

Here is more from Alexis Antoniades and Charles W. Calomiris.