NYT:

At many of these stops, he was accompanied by members of National Nurses United, a seven-year-old union, fanning out from a bright-red bus in matching red scrubs to corral potential Sanders votes.

But the union is not just busing nurses into Iowa. The union’s “super PAC” has spent close to $1 million on ads and other support for Mr. Sanders, the Democratic presidential candidate who has inspired liberal voters with his calls to eradicate such outside groups. In fact, more super PAC money has been spent so far in express support of Mr. Sanders than for either of his Democratic rivals, including Hillary Clinton, according to Federal Election Commission records.

“I do appreciate the irony,” said RoseAnn DeMoro, the executive director ofNational Nurses United. “All things being equal, we would rather not be doing this. On the other hand, we want to see Bernie as president.”