Sanders' line, "I do not have a super PAC, and I do not want a super PAC" is correct with the right terminology. He hasn't tacitly sanctioned a SuperPAC and there is no affiliation or coordination between the Nurses' one and his campaign. That's the difference, even though it's still an outside group contributing to the nomination/election of Sanders.
Not to mention most people inclined to support Sanders would see a very relevant difference between a superPAC funded by wealthy donors and one funded by a labor union. I mean come on.
I don't see why just because a special interest (which unions are) agrees with you makes it any less suspect, especially when your entire campaign is being run against "the corrupt campaign finance system."
