The current one offers Ennahda a second chance to rise above its partisan instinct to try to lock in its control over Tunisia, and to serve instead as an honest broker for all Tunisians.
Labour may have given up its attachment to public ownership and controlling large parts of the economy, but its first instinct is still to distrust the market as a policy tool.
His balancing act is delicate: Britain may find his integrationism hard to bear, France may resent his liberalising instinct and even Mr Monti's authority may not divert Germany from its self-defeating obsession with austerity.