A new study shows members of Congress saw a boost in personal wealth as the U.S. economy suffered the worst of the economic recession. According to the Center for Responsive Politics, lawmakers’ personal wealth increased an average 16 percent between 2008 and 2009. The number of millionaires rose to 261, nearly half the total members of Congress. The median wealth of a House member topped $765,000, while the average for a senator was more than $2.3 million.