The announcement that Delaware attorney general Beau Biden would not run for his father's seat in the Senate left the field wide open for Representative Mike Castle, who held a narrow lead in the polls in a hypothetical match against Biden leading into last week. Unlike many hoping to break into politics in Scott Brown's wake, Castle has been around a long time, anchoring a moderate vision for Eastern Republicans. He was elected to Delaware's only seat in the House after two terms as governor of the left-leaning state and won re-election in 2008 with more than 60% of the vote. Castle also has a 66% favorable rating, something that will be hard for possible Democratic challenger and New Castle County chief executive Chris Coons to beat. Castle is a moderate whose website calls him "an independent voice for Delaware in Congress" and proclaims his support for stem-cell research and the extension of health care to more Americans. He may not fall in with hard-line Republicans, but his election would confirm that even this liberal-leaning state no longer feels much love for its Democrats.