Possible meanings for EVERGREEN:
Personally I think it refers to the notion that Hillary would live thru the inevitable nuclear winter if she had "won," in 2016. But there are also some other meanings shown below. It could also refer to "always flush with cash when everyone else has nothing."
https://www.dictionary.com/browse/evergreen
adjective
(of trees, shrubs, etc.) having green leaves throughout the entire year, the leaves of the past season not being shed until after the new foliage has been completely formed.
retaining its relevance, popularity, usefulness, etc.; enduring:
Some toys are evergreen favorites.