U.S. Senate nominee Mike Franken faced every candidate’s nightmare on September 19 when the Republican-funded website Iowa Field Report published allegations that the Democrat kissed his former campaign manager Kimberley Strope-Boggus without consent.

The Des Moines Police Department’s incident report, dated April 12, described the events that led to Strope-Boggus’ complaint of simple assault. After consulting with an assistant Polk County attorney, Officer Abby Giampolo closed the case as “unfounded,” due to “insufficient evidence to pursue a criminal investigation.”

Since Franken and the staffer he fired in February were alone when the disputed events occurred, we will never know exactly what happened between them on the evening of March 18. Franken has denied the allegations, while Strope-Boggus told Bleeding Heartland and other reporters she is unable to comment at this time.

Every candidate can learn some lessons from this episode.