http://about.dc.gov/statehood.asp
Just like all Americans, residents of Washington, DC:
# pay federal and local taxes;
# serve in the armed forces and make sacrifices in times of war and conflict;
# serve on juries to uphold federal laws and policies.
Yet, DC residents are denied voting representation in the US Senate and the US House of Representatives, and do not have complete autonomy over their own budget and local laws. The Congress - representing everyone except DC residents - has the final say on DC's budget and laws.
DC elects a Delegate to the House of Representatives who can vote in committee and draft legislation, but does not have full voting rights. The current Delegate is Congresswoman Eleanor Holmes Norton.
http://about.dc.gov/statehood.asp