Mousavi's stunning rise also has been helped by his popular and charismatic wife, former university dean Zahra Rahnavard, and their joint calls for more rights and political clout for women. Iranian women work in nearly all levels of society including as parliament members. But they face legal restrictions on issues such as inheritance and court testimony, where their say is considered only half as credible as a man's.
For the first time in Iran, the forces of the Web were fully harnessed in an election showdown. That catapulted Mousavi, a 67-year-old former prime minister from the 1980s, into a political star.
On Friday, dozens of Iranians using Twitter posted messages including one that said: "Keep my fingers crossed for green wave to win."