When the 9th shogun, Yoshihisa ASHIKAGA, died and a problem regarding the shogun's heirship occurred, Masamoto recommended Seiko (son of Horigoe kubo Masatomo ASHIKAGA, and later Yoshizumi ASHIKAGA) become the next shogun.
政元は第9代将軍・足利義尚が陣没して将軍継嗣問題が起こると、第10代将軍に清晃（堀越公方足利政知の子で後の足利義澄）を推していた。