I would argue that "the right to vote is fundamental to a democracy" has never been an American conservative ideal. Conservatives have always tried to limit the number and kind of people that can vote and still do: non land owners, ex-slaves, black people, women, ex-felons, and all minorities now. Conservatives have also made a very successful effort to limit the relative power of people's votes when it doesn't suit their agenda through gerrymandering and unequal representation.
Also, really not sure what "the Senate should represent the states and not the people" means. Like it should represent the land? Not the people inside the state?