The problem with the housing bubble is that it was not contained. Rules were changed on Wall st. to allow banks to leverage faulty mortgages 40x their value to invest in stocks and other assests, creating more bubbles. They also bundled the bad loans and sold them overseas. The Dems had a hand in this but it was mostly Wall st. and the Republican philososphy of deregulation that allowed the bursting bubble to almost sink the world economy. The american public got this and blamed not just Bush but the Republican party as a whole. They blamed deregulation for the mess and Republicans are the party of deregulation.