I really prefer Bernie's policies, but I'm really nervous about him in a general election. Americans are dumb. We've been trained for decades that Socialism=bad. Nobody on the right is talking about Bernie right now. What happens when he is the focus? What if he wins? He's an old guy, will the country re-elect him?
There's really no need to feel anxious about Bernie, in the GE, as Bernie will have millions upon millions of energetic supporters, of all age groups, backing him every step of the way. He may be 74, but he's canvassing like he was twenty years younger, which is no surprise, considering that he was a fine athlete, in his youth (he was captain of the cross-country and track teams in high school). Also, by the end of 2015, he'd raised $73 million, with the average contribution of less than $30, so in the GE, he'd have a much bigger pool of voters to call on, again, and again.