Six presidential candidates on Monday discussed Iran’s economic problems in a four-hour live debate on state TV, ahead of the 28 June presidential election following a helicopter crash last month that killed President Ebrahim Raisi and seven others. It was the first of five debates planned in the 10 days remaining before the vote in a shortened campaign to replace Raisi, a hard-line protégé of Supreme Leader Ayatollah Ali Khamenei once floated as a possible successor to the 85-year-old cleric. The candidates were to discuss their proposals and plans for Iran’s spiraling economy, struggling und…