For decades, he was President Luiz Inacio Lula da Silva¡¯s political rival.

Now his boss¡¯s health issues have put Geraldo Alckmin at the center of questions about Brazil¡¯s future.

As the country¡¯s vice president, Alckmin represents exactly what the leader known universally as Lula wants in a deputy: a hard worker who avoids conflict and is content to stay out of the spotlight.