The text structure of the paragraph can be identified as cause and effect, with elements of problem and solution.
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Cause and Effect: The paragraphs detail the series of events leading to the Senate's decision to block the USDA's proposal regarding potato servings in schools. The cause is the USDA's proposal aiming to limit starchy vegetables (particularly potatoes) in school meals, and the effect is the Senate's successful amendment to block these limits.
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Problem and Solution: It outlines the problem (concerns over children's consumption of potatoes and the critique of USDA's approach) and then discusses the actions taken as a solution (the amendment supported by senators from potato-growing states to maintain flexibility in school meal offerings).
Overall, the structure helps readers understand the sequence of events and the differing viewpoints around the issue of potato servings in schools.