MCLEAN, Va. —
Obama won the district by 4 percentage points in 2012. The primary is June 3.
Democrats in the Philadelphia suburbs are counting on Dr. Manan Trivedi, an Iraq War veteran, to flip a seat held by Republican Rep. Jim Gerlach for six terms. Ryan Costello, a lawyer and Chester County commissioner, is the likely GOP nominee. The primary is May 20.
Democrats are all but certain to flip the California seat held by eight-term Republican Rep. Gary Miller, who is retiring. Obama won the district by 16 percentage points in 2012.