Dan,
Dr. Gutzman is a firm proponent of an Article V Convention and has been for longer than Levin and others have been promoting the idea. It could work, particularly if it is regulated properly. Until then, and possibly forever because there is no guarantee a convention will be called, nullification is the best solution within the framework of the Union.
Here is what I said about it at the Daily Caller: http://dailycaller.com/2014/01/17/mark-levins-fair-weather-federalism/
