Sanders has policy positions on dozens of important issues but two stand out: One, Sanders is a self-described "democratic socialist" and two, he has argued repeatedly that the rich don't pay their fair share of taxes. Presumably, in a Sanders Administration, there would be more "socialism" and higher taxes on the "rich". 

What is democratic socialism? From my training in economics, socialists believe that free-market capitalism is a failed system and that it should be replaced by government ownership of the means of production. This means that all important decisions concerning the production of output and the direction of investment should be made by the State. The "democracy" part of the definition implies that democratic institutions such as a constitution and elections would be preserved. 

Does Bernie Sanders really believe that democratic socialism makes sense? Probably not, for a number of reasons.