Using 2017 census estimates as a proxy for the official one coming in 2020, the Rule of One Hundred yields the following outcome: 26 states get only one senator (having about 1/100 of the population or less), 12 states stay at two, eight states gain one or two, and the four biggest states gain more than two: California gets 12 total, Texas gets nine, and Florida and New York get six each. This apportionment shows how out of whack the current Senate has become.
Read: The people v. the U.S. Senate
In the new allocation, the total number of senators would be 110. The total is more than 100 because 10 of the smallest states have much less than 0.5/100 of the U.S. population but are still entitled to one senator each.
The obvious reply is, “This is impossible! The Constitution plainly says that each state gets two senators. There’s even a provision in the Constitution that says this rule cannot be amended.” Indeed, Article V, in describing the amendment process, stipulates that “no State, without its Consent, shall be deprived of its equal Suffrage in the Senate.”
This seems like a showstopper, and some scholars say it’s “unthinkable” that the one-state, two-senators rule can ever be changed. But, look, when conservative lawyers first argued that the Affordable Care Act violated the Commerce Clause, that seemed unthinkable, too. Our Constitution is more malleable than many imagine.
First, consider that Article V applies only to amendments. Congress would adopt the Rule of One Hundred scheme as a statute; let’s call it the Senate Reform Act. Because it’s legislation rather than an amendment, Article V would—arguably—not apply.
Second, the states, through the various voting-rights amendments—the Fourteenth, Fifteenth, Nineteenth, Twenty-Fourth, and Twenty-Sixth—have already given their “consent” by directing Congress to adopt legislation to protect equal voting rights, and this delegated power explicitly applies to “the United States” as well as the states. The Senate Reform Act would simply shift seats according to population. No state or its citizens would lose the franchise.
Note that even states that did not ratify the voting-rights amendments have, functionally, consented to them, and thus also to the constitutional logic supporting a Senate Reform Act. As Justice Clarence Thomas explained in 1995, “The people of each State obviously did trust their fate to the people of the several States when they consented to the Constitution; not only did they empower the governmental institutions of the United States, but they also agreed to be bound by constitutional amendments that they themselves refused to ratify.”
Remember, too, that the Constitution is a complex framework document that has evolved over the course of more than two centuries. The Civil War inaugurated a century of ever-increasing recognition of voting rights through the aforementioned amendments, which created a new constitutional principle that “the right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State” on specific grounds of race, color, sex, or age. All of these amendments include exactly the same enforcement provision as well: “Congress shall have the power to enforce this [amendment] by appropriate legislation.”