You'd have a great point if Rubio, Cruz,, et. al. were advocating a "living wage" as a major feature of their campaigns.
Bernie Sanders is one of the only Congressmen in Washington who pay their interns at all.
$12 an hour is a lot more of a "living wage" than "free coffee, and we'll validate your parking"
I agree that it is better than nothing. But he's the Social Democrat. He had a chance to take the moral high ground, "walk the walk", and pay his interns a "living wage". He didn't.
According to the link in the OP he apparently had no problem paying his wife and another family member a very a nice consulting fee.....DOH!