A Congressional Vote for Washington DC?

Yesterday, the Senate decided to approve a bill to give Washington DC its first voting member in Congress. The district already has representation, but its representatives are not given a vote. If the bill is passed in both houses, the House of Representatives would permanently increase by two members (another will be given to Utah.) People in agreement with the addition of a House member claim that the people of DC should have a say and be represented in government. People in opposition to the expansion of the House to include a voting member for Washington DC claim that the Constitution would have to be amended in order for this to happen. The Constitution currently states that "No Person shall be a Representative...who shall not, when elected, be an Inhabitant of that State in which he shall be chosen." Because Washington DC is a district rather than a state, the constitutionality of allowing DC a voting member is being debated. The issue revolves around whether or not there should be a loose or strict interpretation of this clause in the Constitution. Should the people of DC have a voice in Congress, or because they are not a state and are a smaller group of people, should their opinions be ignored?