In politics, yesterday's ally can be today's enemy. A recent tug-of-war between two big-name politicians in the ruling camp is a fresh reminder of the adage. President Yoon Suk Yeol and Rep. Ahn Cheol-soo of the ruling People Power Party (PPP) successfully teamed up with each other in the March 9 presidential election last year to field a unified candidate from the main opposition camp. Now they have been pitted against each other amid the PPP's heated race to select a new chairman.