His professional and personal papers from time in Congress. Essentially, like the Presidential libraries, but for a career member of the House and Senate.
The idea was that the Institute would perform some sort of public policy research. What that meant was pretty vague. The idea of housing the papers was that it would attract scholars doing research into policy measures during Harkin's congressional time.
When you consider some of the landmark legislation that Harkin was responsible for - Americans with Disabilties Act for example - this is a very big deal for Iowa State. Harkin has been huge in the area of education for decades.