The achievements of the First Ladies of the United States?

I am writing an essay on how the First Lady is an important role in US politics, yet I can't remember each women's success'. I already have enough on Eleanor Roosevelt, yet I am looking for say the achievements of Jackie Kennedy, the first lady who did something with wild flowers, another with birds. Then there was one who improved literacy in the US. Can anyone help me out? Other suggestions are greatly appreciated. Thank you! =]