And then he goes on to quote Justice Story?
Furthermore, weren't the Senators appointed by the State legislatures at the time? Doesn't make much sense that it was the electorate that would be the check here. What makes more sense is that the Senators, because they were appointed by the legislatures would have the health of their State at the foremost in their mind even if they didn't have their own citizenry in mind.
And certainly, the Senators would be as far removed from the favors of lobbyists as possible. Since they weren't elected and required no warchests to become Senators, the influence of special interests was non-existent.
This is a pretty poor analysis I think. The 17th amendment was a BAD idea.