Some 75,000 unionists, farmers and leftists marched to protest price increases in basic foodstuffs like tortillas, a direct challenge to the new president’s market-oriented economic policies blamed by some for widening the gulf between rich and poor. Since taking office Dec. 1 after a disputed election, President Felipe Calderon has drawn his greatest criticism for failing to control the largest price spike in tortillas in decades. Tortillas are a staple of poor Mexicans’ diet. Full Story