Working as intended, the Senate was never supposed to represent the population it was intended to represent the interests of the individual States.
"The equality of representation in the Senate is another point, which, being evidently the result of compromise between the opposite pretensions of the large and the small States, does not call for much discussion.
In this spirit it may be remarked, that the equal vote allowed to each state, is at once a constitutional recognition of the portion of sovereignty remaining in the individual states, and an instrument for preserving that residuary sovereignty. . . ." -- James Madison, Federalist 62