Your version sounds like an apocryphal variation.
The race was close and Johnson was getting worried. Finally he told his campaign manager to start a massive rumor campaign about his opponent's life-long habit of enjoying carnal knowledge of his own barnyard sows. “Christ, we can't get away with calling him a pig-fucker,” the campaign manager protested. “Nobody's going to believe a thing like that.” “I know,” Johnson replied. “But let's make the sonofabitch deny it.”
Such a small thing would so sully the office of the POTUS so as to genuinely discredit the USA for me.
What's worse is I fear that such a fiend would have no shame for doing something like this. If I were supreme ruler of Earth politicians doing such things would be censured and forced to clean Mumbai sewers for the rest of their days.
How can I vote for either of them, when they are both miscreants?
Sometimes I think they are put there by the main parties to steal votes from their opposition on issues they cannot possibly accommodate.