What are the duties of a 'State Poet Laureate' ?

I imagine it would vary from State to State, but here's what the Poet Laureate to the Library of Congress has to do:
The Laureate receives a $35,000 annual stipend funded by a gift from Archer M. Huntington. The Library keeps to a minimum the specific duties in order to afford incumbents maximum freedom to work on their own projects while at the Library. The Laureate gives an annual lecture and reading of his or her poetry and usually introduces poets in the Library's annual poetry series, the oldest in the Washington area, and among the oldest in the United States. This annual series of public poetry and fiction readings, lectures, symposia, and occasional dramatic performances began in the 1940s. Collectively the Laureates have brought more than 2,000 poets and authors to the Library to read for the Archive of Recorded Poetry and Literature .
SOURCE:
http://www.loc.gov/poetry/laureate.html