Richard Lugar actually said...

But even if public opinion in Iran is in favor of negotiating with the United States, does it make any difference?

One of the positive aspects, although it may be superficial, is that there is a new administration here in the United States.

Iran has not suspended its enrichment-related activities or its work on heavy-water-related projects.

if different countries approach Iran with diverging redlines, I believe the entire diplomatic approach could unravel.