Recent studies have shown that the United States lags behind other developing countries <a href="http://www.huffingtonpost.com/2010/03/17/social-immobility-climbin_n_501788.html">in social mobility </a>-- what is often known as the "American Dream." And it's particularly hard to go from rags to riches<a href="http://crooksandliars.com/blue-texan/social-mobility-much-more-difficult-red"> in the Red States</a>.