It would curtail federal mandates on the states. It would contain the federal government form encroaching state authority. It would take the money and the politics out of the Senate since they would not "campaign" for the office. In my state I would push to give the governor a vote in the selection. Say you have 30 state legislators, give the governors office five votes in the tally, not enough to control but enough to have some influence so that the Senator is also responsible to the governors office. Let each state decide that on their own.