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Why did Gaius Marius veto a popular grain bill?

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Gaius Marius vetoed a popular grain bill to demonstrate that he was not an unprincipled candidate for popular favor.1

While Marius was known for his military success and his eventual reliance on the support of the plebs and equites during his later career, this specific action occurred during his earlier political life. By opposing the grain bill, he signaled a degree of independence from purely populist measures, even as he sought to advance his career within the Roman political system.1