McCreary's senate term was set to expire in 1908, the same year as Beckham's second term as governor. Desiring election to the Senate following his gubernatorial term, Beckham persuaded his Democratic allies to choose the party's nominees for governor and senator by a primary election held in 1906—a year before the gubernatorial election and two years before the senatorial election. This ensured that the primary would occur during his term as governor, when he still wielded significant influence within the party. McCreary now allied himself with J. C. S. Blackburn, Henry Watterson, and other Beckham opponents, and sought to defend his seat in the primary. During the primary campaign, he pointed to his record of dealing with national issues, contrasting it with Beckham's youth and inexperience at the national level. Beckham countered by citing his strong stand in favor of Prohibition, as opposed to McCreary's more moderate position, and by touting his support of a primary election instead of a nominating convention, which he said gave the voters a choice in who would represent them in the Senate. Ultimately, Beckham prevailed in the primary by an 11,000-vote margin, rendering McCreary a lame duck with two years still left in his term.