SECTION 1 The District constituting the seat of Government of the United States shall appoint in such manner as the Congress may direct:A number of electors of President and Vice President equal to the whole number of Senators and Representatives in Congress to which the District would be entitled if it were a State, but in no event more than the least populous State; they shall be in addition to those appointed by the States, but they shall be considered, for the purposes of the election of President and Vice President, to be electors appointed by a State; and they shall meet in the District and perform such duties as provided by the twelfth article of amendment.SECTION 2 The Congress shall have power to enforce this article by appropriate legislation.
On August 22, 1978, Congress submitted the District of Columbia Voting Rights Amendment to the states for ratification. This sweeping proposal would have granted the District of Columbia full representation in the United States Congress as if it were a state, repealed the Twenty-third Amendment and granted the district full representation in the Electoral College plus participation in the process by which the Constitution is amended as if it were a state.
The amendment failed to become part of the Constitution, however, as it was not ratified by the required number of states (38) prior to its August 22, 1985 ratification deadline. The campaign for the proposed amendment ran into much fiercer conservative opposition due to the open and obvious fact that by 1978 the proposed amendment would have practically guaranteed two Democratic senators for some time; the amendment was criticized on various other grounds as well, and was not ratified even by several more "liberal" states.
(Source for image and material quoted above.)
The Congress, whenever two thirds of both Houses shall deem it necessary, shall propose Amendments to this Constitution, or, on the Application of the Legislatures of two thirds of the several States, shall call a Convention for proposing Amendments, which, in either Case, shall be valid to all Intents and Purposes, as Part of this Constitution, when ratified by the Legislatures of three fourths of the several States, or by Conventions in three fourths thereof, as the one or the other Mode of Ratification may be proposed by the Congress; Provided
that no Amendment which may be made prior to the Year One thousand eight hundred and eight shall in any Manner affect the first and fourth Clauses in the Ninth Section of the first Article; andthat no State, without its Consent, shall be deprived of its equal Suffrage in the Senate.
It seems unlikely that all fifty states would ratify such a change in the currently political circumstances of the United States.
I do not believe that this language bars amendments to the electoral college, as illustrated by the precedent of the 23rd Amendment.
Other Ideas For Constitutional Amendments
Some other ideas for constitutional amendments that aren't strictly on topic but go, in part, to U.S. Senate power that isn't unrelated to the discussion above.
Changing The Balance Of Power Between the President, U.S. House and U.S. Senate
Weaken the U.S. Senate
Allow the U.S. House by a two-thirds majority, to enact legislation which is not approved by the U.S. Senate within some set period of time (perhaps six months) with a Presidential signature. The U.S. House would not be able to override a vetoed bill it approved in this manner without U.S. Senate support.
Thus, the two majoritarian branches, the President and U.S. House, could override the U.S. Senate with bipartisan support.
Weaken the President's Veto Power
Reduce the threshold for overriding a Presidential veto, to either (1) majorities in both houses (making the Presidential veto a way to delay a law's enactment because he or she notice a problem with it, rather than actually reallocating power), or (2) a majority of the U.S. Senate and two-thirds of the U.S. House (preventing the unequal level of U.S. Senate representation to be leveraged excessively to prevent a veto override by states representing only a very small percentage of the U.S. population).
Change The Treaty Approval Requirement
Replace the two-thirds approval required for treaties by the U.S. Senate alone with (1) a requirement that treaties be ratified by law, or (2) require majority approval by the U.S. Senate (preventing the unequal level of U.S. Senate representation to be leveraged excessively to prevent a veto override by states representing only a very small percentage of the U.S. population) and two-thirds approval in the U.S. House, for treaties, and provide that treaties override statutes unlike existing U.S. law where a domestic statute can override a treaty.
Require judicial and non-judicial Presidential nominations to be approved by both houses of Congress rather than just the U.S. Senate, provided however, that two-thirds majorities of each house of Congress (rather that the status quo than a majority approval of the U.S. Senate) is required to appoint a U.S. Supreme Court justice (the only lifetime appointees whose decisions can't be overridden by someone else). This would effectively require the President to secure bipartisan approval for nominations when the control of the House and Senate are split, and in all cases for U.S. Supreme Court justices.
End the authority of the President to make recess appointments.
Broaden impeachment eligibility
Allow a President to be impeached for failing to faithfully execute the laws, violating the constitution, or for ceasing to be competent, rather than merely for "high crimes and misdemeanors"
Require a majority vote, rather than a two-thirds majority vote, to convict the President following a vote to impeach in the U.S. House. This would effectively make the President subordinate to the legislature.
Require Bipartisan Support For Actions By Lame Ducks