Apostate

 NY Times: The Rise of the Republican Apostate By Andy Kroll - Mr. Kroll is a reporter for ProPublica and the author of a new book about Seth Rich and the power of conspiratorial thinking in American politics.

...the apostate. The history of American politics is littered with such figures who left one party or faction for another and who profess to have a righteous knowledge that was a product of their transformation.