PRI's national leader, Roberto Madrazo, in his quest to be the party's candidate in 2006.

ECONOMIST: Something for everyone in an important state election

Mr Madrazo had backed last month's vote in Congress to lift the mayor's immunity from prosecution.

ECONOMIST: The race is on | The

Mr Madrazo, the party's former president, faces a strong challenge from Arturo Montiel, the ex-governor of Mexico state.

ECONOMIST: Calder??n changes the calculus