Rep. James P. Moran’s decision to retire after more than two decades in Congress ensures that there will be a huge number of candidates eager to take his Northern Virginia seat. The district’s heavy Democratic tilt means that party’s primary could be especially crowded. Here are the candidates who might consider running:

Democrats

●Former Alexandria mayor Kerry Donley

●State Sen. Adam P. Ebbin (Alexandria)

●Alexandria Mayor William D. Euille

●Arlington County Board Chairman Jay Fisette

●Del. Charniele Herring (Alexandria)

●Del. Patrick A. Hope (Arlington)

●Del. K. Robert Krupicka Jr. (Alexandria)

●Del. Alfonso H. Lopez (Arlington)

●Fairfax Board of Supervisors member Jeff C. McKay

●Del. Mark D. Sickles (Fairfax)

●Del. Scott A. Surovell (Fairfax)

●Former U.S. chief technology officer Aneesh Chopra

●Businessman Bruce Shuttleworth

Republicans

●Former congressional aide Micah Edmond

Laura Vozzella and Patricia Sullivan contributed to this report.