By Marco Aquino and Marcelo Rochabrun LIMA (Reuters) – A bloc of leftist Latin American nations ramped up pressure against Venezuelan opposition leader Juan Guaido on Thursday at a diplomatic summit, although they failed to pass a motion to discuss ousting his representation from the organization. Guaido has claimed to be Venezuela’s rightful president since 2019 and the Organization of American States, which is hosting its General Assembly in Lima, has recognized him. But Guaido has never actually held power, and the country remains led by socialist President Nicolas Maduro. At the OAS Summit…