Supporting Data for "The Scientist Network for Advancing Policy (SNAP): Building Infrastructure for Early-Career Scientists in Policy and Public Engagement"

De-identified supporting data for the figures and descriptive results reported in ‘The Scientist Network for Advancing Policy (SNAP): Building Infrastructure for Early-Career Scientists in Policy and Public Engagement.’ This record includes public-use data on the 2025 Congressional District Visit Days and the McClintock Letters initiative. The files are structured to support reconstruction of the main descriptive figures reported in the manuscript.本数据集为《推进政策科学家网络（The Scientist Network for Advancing Policy，SNAP）：为投身政策与公共参与的早期职业科学家搭建基础设施》一文所报告的图表及描述性研究结果提供去标识化辅助数据。本记录包含2025年国会选区走访日与麦克林托克信件倡议的公开可用数据。数据集文件的结构设计可用于复现该研究手稿中刊载的核心描述性图表。