Republicans are expanding political playing field, Democrats slipping

A tough economy and low job approval ratings for President Obama are two stumbling blocks facing Democrats as the November midterm elections approach. From Associated Press, via Google News:

Obama and his party must defend dozens of seats in the 80 or so House races that are competitive; they include some districts that Democrats have held for decades. The party also faces serious Senate challenges in at least nine states, including Nevada, where Majority Leader Harry Reid trails in the polls. Democratic seats in Illinois and Delaware, once held by Obama and Vice President Joe Biden, respectively, are in jeopardy, too.