I'm not sure what the surprise is. If a candidate is generally hostile toward many of the agencies mentioned in the article, why would employees of said agencies contribute to him. Taken from the article:
Schultz, the Hamline professor, said “self-preservation”— particularly for workers engaged in public sector unions — probably motivates their political giving.
“This means support for their jobs,” he said. “Clinton, for the most part, is going to be probably a continuation of more or less what Obama is.”
Federal government employees, he said, are likely “more willing to give to somebody who would be more predictable in terms of supporting their livelihood, their jobs, as opposed to somebody who might be less predictable.”