For over 200 years, the citizens of the District of Columbia have been without a voting member in the federal legislature. The U.S. is the only nation on earth where the people living in the capital city are without representation. Only since 1971 has D.C. had the right to elect a nonvoting member to the House. In 1978, Congress passed a constitutional amendment that would have given the District a voting House member and two senators had the necessary two-thirds of states approved it by 1985 (only 16 states ratified the amendment).
During the Clinton Administration, the president changed the license plates on the presidential limo to the iconic "Taxation without Representation" plates seen throughout the city. President Bush removed the plates (he was a vocal critic of D.C. voting rights), but many expected President Obama to put the "Taxation" plates back on before his January 20th inauguration (he did not).
Mark Plotkin tries to get White House Press Secretary Robert Gibbs to explain why not at the end of yesterday's press briefing: