While it is clear O'Neill was referring to "a gorgeous personal secretary" who worked for Senator Taft, the language reads like he is listing Taft along with the secretary, which led Slate to report O'Neill's "inadvertent" claim he slept with Senator Taft.
An earlier version of the post gave more information about the identities of those women. O'Neill says his point was to get the past out of the way.
O'Neill has served on the Ohio Supreme Court since 2013 and announced his gubernatorial candidacy in October.
In contrast, the OH supreme court's chief justice condemned her colleague for expressing "gross disrespect for women", and his opponents have called for his resignation. "This gross disrespect for women shakes the public's confidence in the integrity of the judiciary", it concluded.
O'Neill, who had announced his intentions to run for governor of OH in October, made headlines on Friday when he issued a Facebook post intending to defend Minnesota Senator Al Franken, who apologized on Thursday after being accused of sexual misconduct during a USO tour in 2006.
An Ohio Supreme Court Justice and candidate for governor landed in hot water on Friday for "joking and trivializing sexual assault" in a Facebook post. I am sooooo disappointed by this national feeding frenzy about sexual indiscretions decades ago.
He drew a sharp distinction between Franken and others who've been accused of more aggressive actions.
In his post, O'Neill, a candidate for governor, said he wanted to save opponents time researching him.
Only a few hours after the post, O'Neill's campaign spokesman said he had resigned over his boss's comments.
By afternoon, the post had drawn thousands of comments, reactions or shares on Facebook and was a trending topic on Twitter - drawing mostly negative reaction, but some positive comments.
"Democrats are now calling for Al Franken's removal from the United States Senate for an indiscreet act for which he has apologized, the victim has accepted the apology - and now the feeding frenzy begins", O'Neill said.