Under the news radar, two ugly power grabs from a pair of would-be Marxist dictators were announced yesterday from South America. From socialist Venezuela: CARACAS (Reuters) -Maria Corina Machado, one of the favorites to win the Venezuelan opposition's nomination for president in an October primary, has been barred from holding public office for 15 years, the country's controller general said in a letter. Machado, a 55-year-old industrial engineer and former lawmaker, is leading polling for the 13-candidate primary, convened to select a unity candidate to face socialist President Nicolas Maduro in a 2024 election. A previous ban placed on her...