Managua, Nicaragua -- Within hours after the left-wing indigenous leader Evo Morales was elected president of Bolivia last December, another outspoken critic of American power in the hemisphere, Daniel Ortega, sent him a message of “revolutionary jubilation.” As the head of Nicaragua's Sandinista government in the 1980s, Ortega led his country in a war against CIA-sponsored insurgents. Now, sensing the wind of the resurgent Latin American left at his back, he is running for president again. If Ortega wins the November election, he will bring populist rule back to Central America for the first time since his previous presidency, which ended in 1990. But Ortega faces a serious challenge from within the Sandinista Party, and from a most unlikely figure -- Herty Lewites, the balding, 66-year-old son of a Jewish candy manufacturer who landed in Nicaragua in the 1920s after fleeing his homeland. If elected, Lewites would be a very different kind of Sandinista president from the ones...