Boy I take issue with a bunch of this. First - is it really the base or is it a fringe he's appealing to? The same kind of fringe Trump is appealing to that the Republican party has become to centered and not extreme enough? That's not the base. He, like Trump, is appealing heavily with first-timers and people typically outside the political process. You could argue he's tapping into a segment of the democratic base that has gone untapped for awhile, but it sure as hell ain't the base. And second - issues based? I really don't see that with Sanders. He's a couple trick pony, he's just picked some really smart ponies. Again, much like Trump. He and Trump are harping on one issue evenly (free trade agreements) and he's harping on wall-street vs. middle America and college debt. That's really about it. They're smart issues to stump on and they have clearly driven the conversation towards those issues. But they're out there, what further is his campaign accomplishing?