'Acrimony' is the word that comes to mind when I think about Ron Paul's base after the 2012 GOP primary concluded. Holding a shadow convention isn't conciliatory. If the Dems decide to go down a similar route with Sanders, they'd best be careful. Sanders is still building name recognition, but he's already got a bigger slice of the pie than Paul had at this point in the 2012 run up. This is actually why I think trying to marginalize his supporters is dangerous. Falling in line after the primaries is questionably productive for them. Frank is banking that Clinton is non-divisive enough and the GOP specter is scary enough to drive that movement. If Sander's base feels both are harmful...His very unwillingness to be confined by existing voter attitudes, as part of a long-term strategy to change them, is both a very valuable contribution to the democratic dialogue and an obvious bar to winning support from the majority of these very voters in the near term.