I respectfully suggest that you are underestimating the power of motivated cognition. For example, if you believe a conspiracy thoery, then any Omega-verified denial can be explained because the speaker was not in on the truth (i.e. plausible deniability was set up in advance). Actually, I also think you overestimate the importance of fringe theories in partisan politics.

(and just to satisfy my curiosity, what Bill Clinton thing are you referring to?)