MIAMI (AP) — A former Miami congressman and longtime friend of U.S. Secretary of State Marco Rubio was convicted Friday in connection with a secret $50 million lobbying campaign on behalf of Venezuela during the first Trump administration. Jurors found Republican David Rivera and an associate, Esther Nuhfer, guilty on all counts, including failing to register as a foreign agent with the Justice Department and conspiracy to commit money laundering as part of their work for former President Nicolás Maduro’s government. The seven-week trial offered a rare glimpse into Miami’s role as a crossroads for foreign influence campaigns aimed at shaping U.S. policy toward Latin America, one highlighting the city’s reputation as a magnet for corruption and anti-Communist crusaders among its sizable exile population.…