Tehran mayor Mohammad Baqer Qalibaf

Tehran mayor Mohammad Baqer Qalibaf

Atta Kenare/AFP/Getty Images

Mohammad Baqer Qalibaf, mayor of Tehran, is seen on Jan. 9, 2012. Qalibaf, 52 this year, backs a partial liberalization of the economy and has in the past welcomed the possibility of an engagement with U.S. President Barack Obama.