Hamas entered parliament with an absolute majority in its first election. It has achieved, in 20 years, what the Muslim Brotherhood in Egypt has not achieved in 80 years. Turkey's Islamists, regarded as the model of Islamist moderation, came to power only after decades of up-and-down parliamentary politics.

Hamas, in contrast, has never experienced any period of across-the-board suppression. Leaders of the movement were targeted by Israel, and some of its activists did time in Israeli prisons or were forced into exile. But Hamas has been largely free to organize, publish, acquire arms and launch attacks.

Islamist movements have been domesticated in strong states, where they have learned to interact with more powerful forces. But in the West Bank and Gaza, Arafat preferred struggle to state-building. Hamas accepted his nominal status as figurehead of the Palestinian cause, in return for almost complete freedom to do as it pleased.

Not only has Hamas assumed power on its first try. It has done so with its militia, its guns and its ideology intact. Its speedy and sweeping ascent has simply validated its past militancy.