By SIMON ROMERO For decades, Cuba has been held up as an ideological lodestar by leftists across Latin America. Fidel Castro and his longhaired guerrillas fueled inspiration by slashing illiteracy, expanding public health care and raising life expectancy. Even among opponents, Cuba often earned grudging respect as an unyielding bastion of resistance against generations of American presidents. But now Cuba is running out of oil, and its economy is nearing collapse. A new wave of right-wing…