9. Nancy Pelosi (D-Calif.) House Minority Leader Nancy Pelosi (D-Calif.) was the ninth richest member of Congress in 2010, with an average net worth of $101,123,032. Much of her wealth is based on her husband's investments in real estate, a football team and other assets. 14. Dianne Feinstein (D-Calif.) Sen. Dianne Feinstein (D-Calif.) was the 14th richest member of Congress in 2010, with an average net worth of $69,046,622. Feinstein's husband has a number of investments in a diverse range of industires, including a property management firm and a biotech venture.