Mir Hossein Mousavi, the last prime minister before Iran purged the position, will challenge Mahmoud Ahmadinejad and two other moderate reformers in this summer’s presidential election, he announced today. The run will be the reputed moderate’s first major foray since his post was eliminated in 1989, AFP reports. Since then, Mousavi has kept out of the limelight, rarely agreeing to interviews. (More Iran stories.)