Democrats must defend about 60 marginal House seats in 2010, as opposed to about 40 for Republicans. At high risk are 27 Democratic seats and just 13 Republican seats that may see a party switch. | Democrats must defend about 60 marginal House seats in 2010, as opposed to about 40 for Republicans. At high risk are 27 Democratic seats and just 13 Republican seats that may see a party switch. |