The word I'm looking for is a noun. It should be a single word, and fit here: "Jimmy is really a ............ Even after all his shenanigans were made public, he still got the committee to support him."
closed as primarily opinion-based by tchrist♦, anongoodnurse, Misti, oerkelens, Ellie Kesselman Feb 4 '15 at 15:35
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svengali: "One who manipulates or controls another as by some mesmeric or sinister influence; especially a coach, mentor or industry mogul."
"Teflon is a nickname given to persons, particularly in politics, to whom criticism does not seem to stick."
Ronald Reagan, the President of the United States, was called by his detractors "the Teflon president."
You may wish to consider syndicator:
syndicate (verb, transitive): to subject to or manage as a syndicate
by which a syndicate is:
(noun) an association of persons officially authorized to undertake a duty or negotiate business