No person, including a candidate, shall publicly or privately make, in a campaign then in progress, any charge or charges reflecting upon the honesty, integrity or moral character of any candidate, so far as his or her private life is concerned, unless the charge be in fact true and actually capable of proof; and any person who makes any such charge shall have the burden of proof to show the truth thereof when called to account therefor under any affidavit or indictment against him or her for a violation of this section. Any language deliberately uttered or published which, when fairly and reasonably construed and as commonly understood, would clearly and unmistakably imply any such charge, shall be deemed and held to be the equivalent of a direct charge.