many people want to have ALL of our elected officials elected by the people, a popular vote, which would make America a democracy
the founders did not create a democracy because they are unstable, the senate and the president are not meant to be elected by the people.
the senate was appointed by the state legislatures to present their interest, this gives the state governments a direct voice inside of congress, and allows the state governments to protect their powers from the federal government passing legislation which would be outside of the governments delegated powers of article 1 section 8
if you have all officials elected by the people, then the interest is all the same, and this allows government to be lobbied and the government to be infiltrated by special interest groups, turning the government into a oligarchy.
if the senate were in the state legislatures hands, the senate cannot be lobbied because senators must vote by how they are instructed by their state government ,this makes the senates interest not the same as the houses interest.
so the only way legislation can be passed in congress is when the interest of the state governments and the peoples interest come together, this way everyone is represented