While Bannon, for years, has been the Mercer's frontman for their political activities, his departure from the scene would not appear to lessen their influence.

He is a reclusive hedge fund billionaire who made a fortune using complicated algorithms to bet on things other people could not see. One of his gambles was on Donald Trump. And his backing of the long-shot presidential candidate has made Robert "Bob" Mercer, the former co-CEO of Renaissance Technologies, the top powerbroker in Republican politics today.