Kammala wannan jumla: Bayan shekaru 20 na shiru na siyasa, a ranar 9 ga Maris, 2009, Mousavi ya sanar da niyyarsa ta tsayawa takara a zaben shugaban kasa na shekara ta 2009.
Zaben shugaban kasar Iran na 2009. Ya bayyana cewa manyan manufofinsa sune: don kafa tsarin adalci na zamantakewa, daidaito da adalci, 'yancin faɗar albarkacin baki, don kawar da cin hanci da rashawa da kuma hanzarta aiwatar da tsarin zaman kansa na Iran, don haka ya motsa Iran daga abin da ya kira "kasuwanci na sadaka". Mousavi ya soki Shugaba mai ra'ayin mazan jiya na yanzu, Mahmoud Ahmadinejad, saboda zarginsa na rashin kulawar tattalin arziki, yana tambaya, lokacin da Iran "ke samun riba daga hauhawar farashin mai, shin ya (Ahmadinejad) ya hango halin da ake ciki lokacin da farashin zai fadi? " A ranar 16 ga Maris, 2009, tsohon Shugaban Iran Khatami ya janye daga zaben don tallafawa Mir-Hossein Mousavi.