The government-controlled Venezuelan supreme court ruled on Friday that opposition leader Maria Corina Machado will not be allowed to run in the presidential elections set for later this year, dealing a significant blow to the democratic transition roadmap that leader Nicolás Maduro agreed to with the Biden administration in Barbados last year. The ruling against Machado upholds a 15-year ban imposed on her from holding public office. The opposition leader won a primary election vote last year, and according to most polls would easily beat ruling Maduro in a presidential election. Given her hi…