Argentines will be heading to the polls in high-stakes midterm elections that could help shape libertarian President Javier Milei’s political path — and the future of U.S. financial support for his government. Nearly half the lower house and a third of the Senate are up for grabs in a vote Sunday seen as a referendum on Milei’s past two years in power. While his wealthier supporters credit him with opening up the economy and scrapping red tape, others in working-class neighborhoods have grown frustrated with falling wages and sluggish growth. Polls show a tight race between Milei’s party and the left-leaning populist opposition. The result will move markets and test Milei's fragile mandate.