Q: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Sentence: 'Plouffe will join with other political powerhouses like Elaine Chao , former Labor Department secretary , Tom Ridge , former secretary for the Department of Homeland Security , and columnist Eugene Robinson of the Washington Post .', Argument/Subject 1: 'eugene robinson', Argument/Subject 2: 'washington post'
A:
be columnist for