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On Thursday, Salter went on Facebook and posted an article criticizing a comment Walker made about the jihadist group Islamic State (also known as ISIS or ISIL) at the Conservative Political Action Conference. Salter added a colorful comment
"I want to like him but Scott Walker is kind of a dumb a--," Salter wrote.
Salter did not respond to a request for comment from Business Insider.
During the 2008 race, Salter became known as an outspoken staffer who sent reporters colorful missives Politico dubbed "Saltergrams."
Walker is a top Republican contender in the 2016 presidential election. In recent weeks, he's gone from a relative dark horse to leading several polls.
View Salter's Facebook post below: