Sen. Josh Hawley, a Missouri Republican, recently saw his former GOP mentor endorse his opponent in the race for his Senate seat, according to reports. John Danforth, a retired GOP senator and Hawley's former mentor, reportedly said after Jan. 6 that his support of Hawley was the "worst mistake" of his life. Now, he's backing Independent U.S. Senate candidate Jared Young, according to St. Louis Post-Dispatch's report on Thursday.