Senator Russ Feingold (D-Wis.) is about to introduce that amendment. What's that you say? Well. OK, if you insist, I'll take the credit.
Seriously though, the Senate is a drag on democracy. It wasn't until 1913, with the 17th Amendment, that the people (instead of state legislatures) could directly elect Senators. The power of governors to name Senators when there's a mid-term vacancy is a holdover from the pre-1913 days.
Sen. Feingold points out in a statement on his website that the Constitution mandates special elections to fill vacant House seats. It should do the same for the Senate.
It seems to me that if this amendment could ever pass, it would pass now, thanks mainly to Governor Rod Blagojevich. It's hard for me to imagine where much opposition would come from. How do you stand up and say that in many cases the people of a state should not directly elect one of their most important representatives?
Check out Feingold's article on Daily Kos, "A new effort to empower the people," where he addresses common objections to the proposal.