Bartlett's district WAS turned into a heavily D district. I'd be shocked (SHOCKED!) if he somehow manages to win re-election. Once the Dems have an actual candidate, it'll be tough for Roscoe to hold on.
Problem now is that alot of liberal Democrats are gonna have a hard time voting for John Delaney because of the fact that he gave money to now Congressman Andy Harris in 2010 which came out in the primary. He won largely on the backing of moderate to conservative Democrats as well as former President Clinton.