Rep. Michael N. Castle, a Republican candidate for Senate from Delaware, here with his wife, Jane, addresses supporters after his defeat in the primary election on Tuesday, Sept. 14, 2010, in Wilmington, Del. Mr. Castle lost to "tea-party" favorite Christine O'Donnell. (AP Photo/Steve Ruark)

Photo by: Steve Ruark

Rep. Michael N. Castle, a Republican candidate for Senate from Delaware, here with his wife, Jane, addresses supporters after his defeat in the primary election on Tuesday, Sept. 14, 2010, in Wilmington, Del. Mr. Castle lost to "tea-party" favorite Christine O'Donnell. (AP Photo/Steve Ruark)