Cline Center for Advanced Social Research has developed some data sets for textual research. According to the Center's website, this is its purpose as a campus research center:
The Cline Center’s research draws on two types of data resources: extreme-scale collections of unstructured textual data created by news content providers around the world, and structured datasets created by the Cline Center that support a wide range of social science research on human flourishing and societal well-being. The following illustrates just one of the data assets curated or supported by the Cline Center.
For database access and training, contact Dan Shalmon, Engagement Coordinator. Note: For UIUC researchers interested in textual analysis and sentiment, not intended for classroom assignments.