objectivist

adj

1. Of or pertaining to objectivism.

   “(Only now has Republican Congressman Paul Ryan, perhaps realizing that supporting an atheist adulterer might hurt his veep chances, changed his tune from Objectivist fanboy to follower of Thomas Aquinas.)”

noun

1. An advocate of objectivism.

   “What of the current moment, shaping up to be the fourth age of Rand? The Randian politicians are still in place: [Paul] Ryan is now boosted by a cabinet crammed with objectivists.”