The Panama Canal is expanding, but is Panama's democracy shrinking? The country is holding a presidential election on Sunday, May 4 -- and there are growing concerns that right-wing President Martinelli is trying an end run around the constitution. Panamanian presidents are banned from holding consecutive terms in office. But Martinelli's critics say he's attempting to do that indirectly by running his wife, Marta Linares, as his party's vice presidential candidate. Should the party's