Do you think Ensign would reciprocate and not campaign against Reed? I think it's a bit irresponsible to the DSCC that is going to have to put something into this race and their efforts are undermined by their own minority leader.
Ensign and he are friends. It's actually a rather nice set-up for Nevada. The most you'll see out of either is a reenforcing quote calling the Dem candidate "a good, capable man." They may campaign for their respective party members, but viciously attack eachother, no.
Nevada likes the relationship. Their senators are not politically all that close, but they co-operate for the state's good. Neither senator wants to be the one to break that bond.
Too bad we don't have a Nevadan on this board, or at least someone in the Las Vegas media market.